Ashok invests a certain sum of money at 20% per annum, compounded yearly. Geeta invests an equal amount of money at the same rate of interest per annum compounded half-yearly. If Geeta gets ₹ 33 more than Ashok in 18 months, calculate the money invested by each.

At what rate of interest per annum will a sum of ₹ 62500 earn a compound interest of ₹ 5100 in one year ? The interest is to be compounded half-yearly ?

Calculate the C.I. on ₹ 3500 at 6% per annum for 3 years, the interest being compounded half-yearly.