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?