At what rate percent p.a. compound interest would ₹80000 amount to ₹88200 in two years, interest being compounded yearly. Also find the amount after 3 years at the above rate of compound interest.

A certain sum amounts to ₹5292 in 2 years and to ₹5556.60 in 3 years at compound interest. Find the rate and the sum.

In what time will ₹15625 amount to ₹17576 at 4% per annum compound interest?

In what time will ₹1500 yield ₹496.50 as compound interest at 10% per annum compounded annually?