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Basics of Financial Mathematics Test 26

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Basics of Financial Mathematics Test 26
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  • Question 1
    1 / -0
    If $$1000$$ dollars is deposited in a bank account for $$4$$ years at $$8$$% per annum. 
    Calculate interest using compound interest formula.
    Solution
    $$CI=P[(1+\cfrac{r}{100})^n-1]$$
    $$\implies CI=1000[(1+\cfrac{8}{100})^4-1]=360.48\approx 360.5$$
    $$\implies CI=360.5$$dollars.

  • Question 2
    1 / -0
    A sum of Rs.$$15,000$$ is invested for $$3$$ years at $$13$$ % per annum compound interest. Calculate the compound interest.
    Solution
    We have,
    $$P=Rs.\ 15000$$
    $$T=3\ years$$
    $$R=13\%$$
    $$C.I=?$$

    We know that
    $$A=P\left(1+\dfrac{R}{100}\right)^T$$

    $$A=15000\left(1+\dfrac{13}{100}\right)^3$$

    $$A=15000\left(\dfrac{113}{100}\right)^3$$

    $$A=15000\left(\dfrac{113\times 113\times 113}{100\times 100\times 100}\right)$$

    $$A=15\left(\dfrac{113\times 113\times 113}{1000}\right)$$

    $$A=Rs.\ 21,643.455$$

    So, the compound interest
    $$=21.643.455-15000=Rs.\ 6643.455$$

  • Question 3
    1 / -0
    Raman borrowed Rs.$$1,20,000$$ for $$4$$ years at $$8$$ % per year compound interest. Calculate the final amount at the end of four years.
    Solution
    We have,
    $$P=Rs.\ 120, 000$$
    $$T=4\ years$$
    $$R=8\%$$
    $$A=?$$

    We know that
    $$A=P\left(1+\dfrac{R}{100}\right)^T$$

    So,
    $$A=120000\left(1+\dfrac{8}{100}\right)^4$$

    $$A=120000\left(\dfrac{108}{100}\right)^4$$

    $$A=120000\left(\dfrac{108\times 108\times 108\times 108}{100\times 100\times 100\times 100}\right)$$

    $$A=12\left(\dfrac{11664\times 11664}{10000}\right)$$

    $$A=Rs.\ 163258.675\approx Rs.\ 163250$$

    Hence, this is the answer.
  • Question 4
    1 / -0
    Find the compound interest on Rs. $$2,000$$ for $$3$$ years, compounded annually at $$12\%$$ per annum.
    Solution
    Given: $$P=Rs\ 2000$$

                $$T=3$$ years 

                $$R=12\%$$ p.a.

    So, Interst for the first year $$=\cfrac{2000\times 12\times 1}{100}$$

                                           $$=Rs\ 240$$

    Amount after the first year $$=P+$$ Interest for the first year

                                                 $$=Rs.\ 2000+Rs.\ 240=Rs.\ 2240$$


    Interst for the second year $$=\cfrac{2240\times 12\times 1}{100}$$

                                                 $$=Rs.\ 268.8$$

    Hence, the amount after the second year $$=Rs.\ 2240+Rs.\ 268.8=Rs.\ 2508.8$$


    Interst for the third year $$=\cfrac{2508.8\times 12\times 1}{100}$$

                                             $$=Rs.\ 301.056$$

    Amount after the third year $$=Rs.\ 2508.8+Rs.\ 301.056=Rs.\ 2809.856$$


    Compound interest $$=$$ Final amount $$-$$ original amount

                                      $$=Rs.\ 2809.856-Rs.\ 2000$$
     
                                      $$=Rs.\ 809.856$$ 

                                      $$\approx Rs.\ 810$$
  • Question 5
    1 / -0
    A sum of Rs.$$100,000$$ is invested for $$4$$ years at $$13$$ % per annum compound interest. Calculate the interest.
    Solution
    $$CI=P[(1+\cfrac{r}{100})^n-1]$$
    $$\implies CI=100,000[(1+\cfrac{13}{100})^4-1]\\ \implies CI=63,047.36\approx 63,000$$.
    Hence, interest$$=Rs.63000$$.
  • Question 6
    1 / -0
    Find the rate which will amount to Rs. $$12,100$$ in two years, if the principle amount was Rs $$10,000$$.
    Solution
    We have,
    $$P=Rs.\ 10000$$
    $$T=2\ years$$
    $$R=?$$
    $$A=Rs.\ 12100$$

    We know that
    $$A=P\left(1+\dfrac{R}{100}\right)^T$$

    So,
    $$12100=10000\left(1+\dfrac{R}{100}\right)^2$$

    $$\left(1+\dfrac{R}{100}\right)^2=\dfrac{121}{100}$$

    $$1+\dfrac{R}{100}=\dfrac{11}{10}$$

    $$\dfrac{R}{100}=\dfrac{1}{10}$$

    $$R=10\%$$

    Hence, this is the answer.
  • Question 7
    1 / -0
    A car which costs $$\text{Rs. } 3,50,000$$ depreciates by $$10$$% every year. What will be the worth of the car after three years?
    Solution
    Given:
    Principal, $$P =Rs.\ 350000$$
    Rate, $$R= 10\%$$
    Time, $$T=3$$ years

    The worth of car after $$3$$ years will be,
    $$\begin{aligned}{}350000{\left( {1 - \frac{{10}}{{100}}} \right)^3}& = 350000 \times \frac{9}{{10}} \times \frac{9}{{10}} \times \frac{9}{{10}}\\ &= \text{Rs. }2,55,150\end{aligned}$$

    So, the price of the car after $$3$$ years will be equal to $$\text{Rs. } 2,55,150.$$
  • Question 8
    1 / -0
    Madhavi bought a scooter for $$Rs. 40,000$$ but she does not have enough money to pay all at once. The shopkeeper says that she can divide the cost into 4 equal monthly instalments but she would have to pay $$Rs.100$$ extra each month for 4 months. What is this additional amount paid by Madhavi to the shopkeeper called as and calculate the total extra amount at the end of 4 months paid by Madhavi?
    Solution
    $$Cost \space of \space scooter=Rs.40000$$
    $$No. \space of \space installments=4$$
    $$\therefore cost \space of \space each \space installments=\frac{40000}{4}$$
    $$=10000$$
    $$But \space 100 \space is \space paid \space extra \space in \space each \space instalment.$$
    $$Total \space extra \space amt. \space paid=100\times4=400$$
    The  seller  costs  this  extra  $$400$$  as  interest  as  the  profit  is  included  in  $$Rs.40000$$
    $$\therefore option \space D$$
  • Question 9
    1 / -0
    Belose Infrastructures  just issued 10 million Rs100-par bonds payable carrying 8% coupon rate and maturing in 5 years. The bond indenture requires GI to set up a sinking up to pay off the bond at the maturity date. Semi-annual payments are to be made to the fund which is expected to earn 10% per annum. Find the amount of required periodic contributions.
  • Question 10
    1 / -0
    The simple interest at $$x\%$$ for $$x$$ years will be Rs. $$x$$ on a sum of _________.
    Solution
    Let principal sum be $$y$$
    Simple Interest $$=$$ Principal $$\times$$ Rate $$\times$$ Time

    $$\therefore x = y\times \dfrac{x}{100} \times x$$

    $$\therefore y =$$  Rs. $$\dfrac{100}{x}$$
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