19) What is the interest earned, if the principal is Rs.12000/- becomes to an amount of Rs.15600/-?

20) What is the principal amount deposited, if the maturity proceeds to an amount of Rs.25000/- and interest earned Rs.6000/-?

21) What is the interest earned, if the principal is for Rs.12500/- maturity becomes to a amount of Rs.17500/-?

22) What is the matured amount for the deposit of Rs.5000/- and the simple interest earned for Rs.500/-?

23) What is the simple interest for the principal amount of Rs.100000 at 10% per annum for 1 year period?