A tradesman gives $4 \%$ discount on the marked price and gives $1$ book free for buying every $15$ books and thus gains $35 \% .$ The marked price is increased above the cost price by (appx.) (in $\%$)

A shopkeeper sells a badminton racket, whose marked price is $Rs.\, 30$, at a discount of $15 \%$ and gives a shuttle cock costing $Rs.$ $1.50$ free with each racket. Even then he makes a profit of $20\%.$ His cost price per racket is (in $Rs$)

A shopkeeper sold Sarees at $Rs.$ $266$ each after giving $5\%$ discount on labelled price. Had he not given the discount, he would have earned a profit of $12 \%$ on the cost price. What was the cost price of each Saree? (in $Rs.$)

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

If the selling price is tripled and cost price doubled the profit would become $65 \% .$ What is the present profit (in $\%$)?

An article is sold for $Rs.\,4950$ at a gain of $10 \% .$ What would have been the gain or loss per cent if it had been sold for $Rs$ $4275 ?$