The simple interest on a sum of money at 12% per annum for 1 year is ₹ 900. Find :

(i) the sum of money and

(ii) the compound interest on this sum for 1 year, payable half-yearly at the same rate.

What sum of money will amount to ₹ 18,150 in 2 years at 10% per annum, compounded annually?

On what sum of money will the compound interest for 2 years at 8% per annum be ₹ 7,488?

The difference between the simple interest and the compound interest on a sum of money for 2 years at 12% per annum is ₹ 216. Find the sum.