A man invests ₹1200 for two years at compound interest. After one year the money amounts to ₹1275. Find the interest for the second year correct to the nearest rupee.

At what rate percent per annum compound interest will ₹2304 amount to ₹2500 in 2 years?

At what rate percent will ₹2000 amount to ₹2315.25 in 3 years at compound interest?

If ₹40000 amounts to ₹48620.25 in 2 years, compound interest payable half-yearly, find the rate of interest per annum.