Construct a schedule for the amortization of:

(a) a debt of $15,000,000 with interest at 12% by 5 equal annual payments.
(b) a debt of $25,000,000 with interest at 12.5% compounded semi-annually by making 6 equal semi-annual payments.

To construct a schedule for the amortization of a debt, we need to calculate the equal payments required for each period. Let's work through both scenarios step by step:

(a) Debt of $15,000,000 with 12% interest by 5 equal annual payments:
To calculate the equal annual payments, we will use the formula for the present value of an annuity:

Payment = Principal / Present Value of an Ordinary Annuity

The Present Value of an Ordinary Annuity formula is:

PV = Payment x (1 - (1 + interest rate)^-n) / interest rate

Where:
PV is the Present Value of the annuity,
Payment is the equal annual payment,
Interest rate is the interest rate per period, and
n is the number of periods.

In this case, the principal amount is $15,000,000, the interest rate is 12%, and the number of periods is 5.

Plugging these values into the formula, we can calculate the equal annual payment:

Payment = $15,000,000 / [(1 - (1 + 0.12)^-5) / 0.12]
Payment ≈ $4,024,310.53

So, the equal annual payment for this scenario is approximately $4,024,310.53.

Now, let's construct the amortization schedule:

Year 1:
Opening Balance: $15,000,000
Payment: $4,024,310.53
Interest: $15,000,000 x 0.12 = $1,800,000
Principal Repayment: Payment - Interest = $4,024,310.53 - $1,800,000 = $2,224,310.53
Closing Balance: Opening Balance - Principal Repayment = $15,000,000 - $2,224,310.53

Repeat this calculation for each subsequent year, adjusting the Opening Balance each year until the debt is fully amortized.

(b) Debt of $25,000,000 with 12.5% compounded semi-annually by making 6 equal semi-annual payments:
To calculate the equal semi-annual payments, we will use the same formula as the previous scenario.

In this case, the principal amount is $25,000,000, the interest rate is 12.5%, and the number of periods is 6.

Plugging these values into the formula, we can calculate the equal semi-annual payment:

Payment = $25,000,000 / [(1 - (1 + (0.125/2))^-6) / (0.125/2)]
Payment ≈ $3,858,668.27

So, the equal semi-annual payment for this scenario is approximately $3,858,668.27.

Now, let's construct the amortization schedule:

Year 1 (First Semi-Annual Payment):
Opening Balance: $25,000,000
Payment: $3,858,668.27
Interest: Opening Balance x (0.125/2) = $25,000,000 x (0.125/2) = $1,562,500
Principal Repayment: Payment - Interest = $3,858,668.27 - $1,562,500 = $2,296,168.27
Closing Balance: Opening Balance - Principal Repayment = $25,000,000 - $2,296,168.27

Repeat this calculation for each subsequent semi-annual payment, adjusting the Opening Balance each time until the debt is fully amortized.

That's how you construct a schedule for the amortization of a debt with equal payments.