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To find the sum of money that amounts to a certain value in the future, we can use the formula for compound interest:

A = P(1 + r/n)^(nt)

Where:

A = the future amount

P = the principal (initial amount)

r = the interest rate (in decimal form)

n = the number of times interest is = 12,00 ×1.21550625

A ≈ 14,586.07

Therefore, the sum of money that amounts to 12,000 in 4 years at a 5% interest rate per annum is approximately 14,586.07.

(ii) For the second scenario, where the principal is 8,250 in 5 years at an interest rate of 7.5% per annum, we can use the same formula:

A = 8,250(1 + 0.075/1)^(1*5)

A = 8,250(1.075)^5

A = 8,250 * 1.407100044

A ≈ 11,602.18

Therefore, the sum of money that amounts to 8,250 in 5 years at a 7.5% interest rate per annum is approximately 11,602.18.