If an item is sold for $Rs. 924$,there is a profit of $10\%$. What is the cost price?

The marked price of a clock is $Rs. 3200$. It is sold at $Rs. 2448$ after two successive discounts. If the first discount is $10 \%$,then the second discount is.........$\%$

$A$ man bought nine pens for a rupee. How many pens should he sell for a rupee to gain $50 \%$?

$A$ man bought apples at the rate of $8$ for $Rs. 34$ and sold them at the rate of $12$ for $Rs. 57$. How many apples should be sold to earn a net profit of $Rs. 45$?

$A$ fan costing $Rs. 1200$ is being sold for $Rs. 1500$. What is the profit percent?

$A$ toothpaste labeled at $Rs. 80$ is sold for $Rs. 68$. The rate of discount is.......$\%$