The difference between a discount of $40 \%$ on $Rs. 500$ and two successive discounts of $36 \%$ and $4 \%$ on the same amount is (in $Rs.$)

The difference between the simple interest and the true discount on a certain sum of money for $2$ years at $15 \%$ per annum at simple interest is $Rs. 45$. Find the sum (in $Rs.$).

The banker's discount on a certain sum of money is $Rs. 84$ and the true discount on the same sum for the same time is $Rs. 70$. The sum due is (in $Rs.$)

$A$ merchant marks an article $20\%$ above cost price. He then sells it at a discount of $20\%$. The sale gives him

At $20 \%$ discount,the selling price of an article is $Rs. 2400$. What is the selling price (in $Rs.$) if the discount is $32.5 \%$?

The true discount on a bill of $Rs. 2550$ due after $3$ months is $Rs. 50$. Find the banker's discount (in $Rs.$).