An electric pump was sold at a profit of $15 \% .$ Had it been sold.for $Rs.\, 600$ , the profit would have been $20 \% .$ The former selling price is in $Rs.?$

Savita buys $5$ shirts and $10$ pants for $Rs.$ $1600 .$ She sells shirts at a profit of $15 \%$ and pants at a loss of $10 \% .$ If her over all profit was $Rs.\,90$ what was the cost price of a shirt and a pant in $Rs.$?

A shopkeeper sells rice at $10 \%$ profit and uses weight $30 \%$ less than the actual measure. His gain percent is

An article is sold at a certain fixed price. By selling it at $\frac{2}{3}$ of that price, one loses $10 \%$. The gain percent on selling it at the original price is

Two toys are sold at $Rs.\,504$ each. One toy brings the dealer a gain of $12 \%$ and the other a loss of $4 \%$. The gain or loss per cent by selling both the toys is

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