On a certain sum of money, invested at the rate of 10 percent per annum compounded annually, the interest for the first year plus the interest for the third year is ₹ 2,652. Find the sum.

During every financial year, the value of a machine depreciates by 12%. Find the original cost of a machine which depreciates by ₹ 2640 during the second financial year of its purchase.

A sum of ₹ 13500 is invested at 16% per annum compound interest for 5 years. Calculate :

(i) the interest for the first year.

(ii) the amount at the end of the first year.

(iii) the interest for the second year, correct to the nearest rupee.

Saurabh invests ₹ 48000 for 7 years at 10% per annum compound interest. Calculate :

(i) the interest for the first year.

(ii) the amount at the end of second year.

(iii) the interest for the third year.