Calculate the amount and the compound interest on ₹ 10,000 in 3 years at 8% per annum.

Calculate the compound interest on ₹ 5,000 in 2 years, if the rates of interest for successive years are 10% and 12% respectively.

Mohan borrowed ₹ 16,000 for 3 years at 5% per annum compound interest. Calculate the amount that Mohan would have to pay at the end of 3 years.

Rekha borrowed ₹ 40,000 for 3 years at 10% per annum compound interest. Calculate the interest paid by her for the second year.