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Comparing Quantities Test - 12

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Comparing Quantities Test - 12
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  • Question 1
    1 / -0
    If the selling price of 20 articles is the same as the cost price of 23 articles, then the profit percentage is
    Solution
    Let the cost price of 1 article be Rs100
    Cost price of 20 articles will be Rs2000
    Cost of 23 articles will be2300
    Given that selling price of 20 articles will be same as cost price of 23 articles
    Profit on 20 articles will be=(2300-2000)=Rs300
    Gain percant will be$$=\frac { Gain }{ Cost\quad price } \times 100$$
                                     $$=\frac { 300 }{ 2000 } \times 100=15%$$
    Gain will be 15%
  • Question 2
    1 / -0
    If the amount is $$\text{Rs. } 500$$ and the interest is $$\text{Rs. }100,$$ then principal is
    Solution
    $$Principal \  = A - I = 500 - 100 = Rs. 400$$
  • Question 3
    1 / -0
    By selling a T.V for Rs.$$1,064$$ a man gains $$12$$%. At what price did he buy the T.V?
    Solution
    Let $$CP=x$$
    Gain $$=\cfrac{12}{100}x=\cfrac{3x}{25}$$
    SP$$=\cfrac{3x}{25}+x=\cfrac{28x}{25}$$
     $$\Rightarrow$$ $$\cfrac{28x}{25}+x=\cfrac{28x}{25}$$
    $$\Rightarrow$$ $$\cfrac{28x}{25}=1,064$$
    $$\Rightarrow$$ $$x=$$ Rs.$$950$$
  • Question 4
    1 / -0
    A sum of money lent by Hari at simple interest becomes double of itself in 8 years. Then the sum will triple itself in
    Solution
    Sum of money be P
    Amount will be=2P
    time=8yrs
    rate=r%
    Simple interest=amount -principal
                               =(2P-P)=P
                                 $$P=\frac { P\times 8\times r }{ 100 } $$
                                 $$8r=100$$
                                  $$r=12.5$$%

    Now,
               Principal=P
               Amount=3P
          Therefore interest=3P-P=2P
    $$2P=\frac { P\times T\times 12.5 }{ 100 } $$
    $$12.5T=200$$
    $$T=\frac { 200 }{ 12.5 } =16years$$
    Sum will triple itself in 16 years


  • Question 5
    1 / -0
    If the cost price of 18 chairs is equal to selling price of 16 chairs, then the gain percent is
    Solution
    Let the cost price of $$1$$ chair be Rs $$100$$
    cost price of $$16$$ chairs will be Rs $$1600$$
    Cost price of $$18$$ chair will be Rs $$1800$$
    Given that cost price of $$18$$ chairs will be equal to  selling price of $$16$$ chairs
    Gain on $$16$$ chairs will be $$(1800-1600)=Rs200$$
     Gain Percent$$=\dfrac { Gain }{ Cost\quad Price } \times 100$$
     $$=\dfrac { 200 }{ 1600 } \times 100$$
    $$=12.5\%$$
    Gain percant will be $$12.5\%$$
  • Question 6
    1 / -0
    A certain sum of money $$Q$$ was deposited for $$5$$ years and $$4$$ months at $$4.5\%$$ simple interest and amounted to $$Rs\ 248.$$ Then the value of $$Q$$ is
    Solution
    When the principal is $$P$$, the rate of interest is $$R$$ per annum and the time period is $$T$$ years then the simple interest is given by,
    $$SI=\dfrac { P\times T\times R }{ 100 } $$

    Given:
    $$P=Q$$
    $$R=4.5\%$$
    $$T=5$$ years $$4$$ months

        $$=5\dfrac { 4 }{ 12 }$$

        $$ =5\dfrac { 1 }{ 3 } $$

        $$=\dfrac { 16 }{ 3 }$$

    So,
    $$SI=\dfrac { Q\times 16\times 4.5 }{ 100\times 3 }$$
          $$ =\dfrac { 24Q }{ 100 } $$

    Principal $$+$$ Interest $$=$$ Amount
    $$\Rightarrow Q+\dfrac { 24Q }{ 100 } =248$$
    $$\Rightarrow 100Q+24Q=24800$$
    $$\Rightarrow 124Q=24800$$
    $$\Rightarrow Q=Rs\ 200$$
  • Question 7
    1 / -0
    What will be the fraction of $$20\%$$ ?
    Solution
    The fraction of $$20\%$$ is 
    $$20\times \dfrac {1}{100}=\dfrac {1}{5}$$
    Hence, option B is correct.
  • Question 8
    1 / -0
    If the cost price is $$25\%$$ of selling price, then find the profit percent.
    Solution
    Let the S.P be Rs. $$100$$
    Then C.P will be Rs. $$25$$
    Profit will be $$75$$
    Profit $$\%=\dfrac{75}{25}\times100\%=300\%$$
  • Question 9
    1 / -0
    Which of the following statement is incorrect
    Solution
    $$\textbf{Step 1: Check which of the following statements is correct.}$$

                  $$\text{As we know that, }$$
                  $$\text{If cost price(C.P) is greater than the selling price(S.P), then seller incurred a loss,}$$
                  $$\text{and If cost price(C.P) is less than the selling price(S.P), then seller incurred a profit.}$$
                  
                  $$\text{Therefore, Statements A,C are correct and D is incorrect.}$$

    $$\textbf{Hence, option D is correct answer.}$$
  • Question 10
    1 / -0
    The money borrowed or lent out for a certain period is called
    Solution
    Money borrowed or lent out for a certain period is called the principal or the sum.
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