In how many years will Rs 750 amount to Rs 900 at 4% per annum?

In how many years will Rs 6250 amount to Rs 7290 at 8% per annum, compounded annually?

In how many years will Rs 1800 amount to Rs 2178 at 10% per annum when compounded annually?

In how many years will Rs.2,000 amounts to Rs.2,420 at 10% per annum amount interest?

In how many years will 800 amount to Rs 882 at 5% per annum be compounded annually ?

In how many years will Rs 7,000 amount to Rs 9,317 at 10 per cent per annum compound interest?

In how many years will Rs 2000 amount to Rs 2163.20 at 4% p.a compounded annually

In how many years Rs. 3000 amount to Rs. 5184 at 20% per annum compound interest ?

Calculate in how many years will Rs. 300000 amount to Rs. 399300 at the rate of 10% compound interest per annum.