Comparing Quant...

The cost price of an article is $$\displaystyle \frac {3}{5}$$ times of its selling price. Find the loss or the gain as percent.

A book seller bought $$200$$ textbooks for Rs. $$12000$$. He wanted to sell them at a profit so that he get $$20$$ books free. At what profit per cent should he sell them?

A trader marks his goods at 25% above his cost price and allows a discount of $$\displaystyle12 \frac{1}{2}$$% on purchases for cash payment. The profit percent he makes is: 

If a commission $$10\%$$ given on the marked price of a book, the publisher gain $$20\%$$.

A manufacturer undertakes to supply $$4000$$ pieces of particular component at Rs. $$100$$ per piece. According to his estimates, even if $$10$$% fail to pass the quality tests, then he will make a profit of $$20$$%. However, as it turned out, $$50$$% of the components were rejected. What is the loss to the manufacturer ?

A man sells two articles for the same price for Rs. $$640$$. He earns $$20$$% profit on the first and $$10$$% profit on the second. Find the over all percent profit.

A pirate purchased an old bicycle for $$ Rs.\ 960$$. He spent $$20 \%$$ of the cost on its repair. If he wants to earn $$ Rs\ 288$$ as net profit on it, find profit $$\%$$.

Calculate the principal when time $$= 10$$ years, interest = Rs. $$3000$$; rate $$= 5\%$$ p.a.

$$1\%$$ of $$1\%$$ of $$25\%$$ of $$1000$$ is :

Jenn borrowed Rs. $$5,000$$ for $$5$$ years and had to pay Rs. $$1,500$$ simple interest at the end of that time. What rate of interest did she pay?