A white goods dealer pays $10 \%$ custom duty on an i-phone that costs $Rs.\, 25000$ in $UK$. For how much should hemark it, if he desires to make a profit of $20 \%$ after giving a discount of $25 \%$ to the buyer? (in $Rs$)

A person bought an article for $Rs\,240.$ For how much should he sell it so as to lose $20 \% ?$

A shopkeeper gains $17 \%$ after allowing a discount of $10 \%$ on the marked price of an article. Find his profit percent if the article is sold at marked price allowing no discount.

A person sold a horse at a gain of $15 \% .$ Had he bought it for $25 \%$ less and sold it for $Rs.\,60$ less, he would have made a profit of $32 \% .$ The cost price of the horse was (in $Rs.$)

A person sells taperecorders at $Rs. 1134$ each after giving a discount of $19 \%$ on the marked price. Had he not given the discount, he would have earned a profit of $40 \%$ on the cost price. The cost price of each taperecorder is (in $Rs.$)

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