The present worth of a certain sum due sometime hence is $Rs. 1700$ and the true discount is $Rs. 170$. The banker's gain is (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 $Rs.$)

The banker's discount on $Rs. 2400$ at $12 \%$ p.a. is the same as the true discount on $Rs. 2520$ for the same time and at the same rate. The time is (in months):

An article is marked $40 \%$ above the cost price and a discount of $30 \%$ is allowed. What is the gain or loss percentage?

$A$ photographer allows a discount of $10 \%$ on the advertised price of a camera. The price (in $Rs.$) that must be marked on the camera,which cost him $Rs.\, 600$,to make a profit of $20 \%$ would be

$A$ fan is listed at $Rs. 150$ with a discount of $20 \%$. What additional discount must be offered to the customer to bring the net price to $Rs. 108$? (in $\%$)