$A$ fair price shopkeeper takes $10 \%$ profit on his goods. He lost $20 \%$ of his goods due to theft. What is his loss percentage (in $\%$)?

If eggs are bought $12$ for $Rs. 10$ and sold at $10$ for $Rs. 12$,what is the gain or loss $\%$?

Rajesh sells a tape recorder to Mihir at a loss of $10 \%$,and Mihir sells it to Shiv at a loss of $20 \%$. If Shiv pays $Rs. 1440$ for it,at what price did Rajesh buy it? (in $Rs.$)

Find a simple discount equivalent to a discount series of $10 \%, 20 \%$ and $25 \%$ (in $\%$).

The cost price of $100$ books is equal to the selling price of $60$ books. The gain percentage or loss percentage is:

By selling an article for $Rs. 21$,a man incurs a loss such that the percentage loss is equal to the cost price. The cost price of the article is (in $Rs.$):