In what time will Rs 4400 become Rs 4576 at 8% per annum interest compounded half-yearly?

In what time will Rs 64000 amount to Rs 68921 at 5% per annum, interest being compounded half-yearly?

In what time will Rs 64000 amount to Rs 68921 at 5% per annum, interest being compounded half-yearly?

In what time will Rs. 10,000 amount to Rs. 13310 at 20% per annum compounded half yearly?

In what time will Rs. 1000 amount to Rs. 1331 at 20% per annum, compounded half yearly?

What sum will amount to Rs 6760 at 8% per annum in I year when the interest is compounded half yearly?

What sum will become Rs 9826 in 18 months if the rate of interest is 5/2 % per annum and the interest is compounded half-yearly?