In how much time rs. 6400 will amount Rs. 6561 at the rate of 5% compound interest when interest is compounded quaterly?

In how much time Rs. 64000 will amount Rs. 68921 at the rate of 10% compound interest per annum if interest is compounded quarterly?

In what time Rs.8000 will amount to Rs.9261 at 10% per annum compound interest, when the interest is compounded half-yearly?

In how much time would Rs 5000 amount to Rs 6655 at 10% per annum compound interest?

In how much time would Rs 5000 amount to Rs 6655 at 10% per annum compound interest?

The amount on Rs. 1000 for 2 years at the rate of 5% compound interest per annum is

Calculate the amount on Rs. 20000 at the rate of 5% compound interest per annum for 2 years.

In how many years will Rs. 400 amount to Rs. 441 at 5% compound interest?