A shopkeeper earns a profit of $12 \%$ on selling a book at $10 \%$ discount on the printed price. The ratio of the cost price and the printed price of the book is

Ajit caculates his profit percentage on the selling price whereas Rohit calculates his on the cost price. They find that the difference of their profits is $Rs.\, 100.$ If the selling price of both of them are the same and both of them get $25\%$ profit, find their selling price? (in $Rs.$)

Arun marks up the computer he is selling by $20 \%$ profit and sells them at a discount of $15 \%$. Arun's net gain percent is

A shopkeeper sold decks at $Rs.\, 166$ each after giving $17 \%$ discount on labelled price. Had he not given the discount, he would have earned a profit of $25 \%$ on the cost price. What was the cost price of each deck? (in $Rs.$)

A shopkeeper sells one transistor for $Rs.\, 840$ at a gain of $20 \%$ and another for $Rs.\, 960$ at a loss of $4 \% .$ His total gain or loss percent is

There is a profit of $20 \%$ on the cost price of an article. The per cent of profit, when calculated on selling price is.......$\%$