7. Rs. 20 is the true discount on Rs. 260 due after a certain time. What will be the true discount on the same due after half of the former time, the rate of interest being the same:

8. A trader owes a merchant Rs. 901 due 1 year�s hence. However, the trader wants to settle the account after 3 months. How much cash should he pay, if rate of interest is 8% per annum:

9. If the true discount on a sum due 2 years hence at 5% per annum be Rs. 75, then the sum due is: