On a deposit earning 10% per annum compounded annually, the interest credited in the third year is ₹2662. The interest credited in the FIRST year (in ₹) is:

Each year's interest is 1.10 times the year before, so the first year's interest is $2662/1.10^2$ = ₹2200. (The three years run ₹2200, ₹2420, ₹2662 on a deposit of ₹22000.) ₹2420 is the SECOND year's interest, one step short; ₹2662 repeats the figure given; and dividing by $1.10^3$ to get ₹2000 steps back one year too far — from the first year's interest to the deposit's own tenth part a year earlier.