If interest be compounded half-yearly, then find the compound interest on ₹8,000 at the rate of 20% per annum for 1 year. 

A person borrows Rs.1,00,000 from a bank at 10% per annum simple interest and clears the debt in five years. If the instalment paid at the end of the first, second, third and fourth years to clear the debt are Rs.10,000, Rs.20,000, Rs.30,000 and Rs.40,000, respectively, what amount should be paid at the end of the fifth year to clear the debt?

A sum invested at compound inrerest amounts to ₹7,800 in 3 years and ₹11,232 in 5 years. What is the rate per cent? 

Compute the compound interest on ₹ 8,400 for one and half years at 12% rate of interest per annum, compounded half yearly.

A sum of ₹14,375, when invested at r% interest per year compounded annually, amounts to ₹16,767 after two years. What is the value of r?

A certain sum amounts to Rs. 5,832 in 2 years at 8% per annum compound interest, the sum is: 

A certain sum, invested at 4% per annum compound interest, compounded half yearly, amounts to Rs. 7,803 at the end of one year. The sum is: 

A certain sum of money yields Rs. 1261 as compound interest for 3 years at 5% per annum. The sum is: