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

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

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

What is the difference (in ₹) between the simple interest and the compound interest on a sum of ₹8000 for $$32{2\over 5}$$ years at the rate of 10% p.a., when the interest is compounded yearly?

The compound interest on a sum of ₹5,500 at 15% p.a. for 2 years, when the interest is  compounded 8 monthly, is:

A certain sum is lent at 4% p.a. for 3 years, 8% p.a. for the next 4 years, and 12% p.a. beyond 7 years. If for a period of 11 years, the simple interest obtained is ₹27,600, then the sum is (in ₹):

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: