1. Stating the problem: We need to verify the calculations for interest (I), effective interest rate (EIR), interest cost (IC), and average operating cost (AOC) based on the given answers. 2. Formulae and rules: - Interest (I) is usually calculated as $I = P \times r \times t$ where $P$ is principal, $r$ is rate, and $t$ is time. - Effective Interest Rate (EIR) is calculated as $EIR = \left(1 + \frac{i}{n}\right)^n - 1$ where $i$ is nominal rate and $n$ is compounding periods. - Interest Cost (IC) is total interest paid. - Average Operating Cost (AOC) is a percentage representing average costs. 3. Verification of A1: - Given $I = 39266.67$ and $EIR = 6.47\%$. - Check if $I$ matches $P \times r \times t$ with assumed values. 4. Verification of A2: - Given $I = 50666.67$, $IC = 57000$, and $EIR = 9.02\%$. - Confirm $IC$ includes $I$ plus other costs. 5. Verification of A3: - Given $AOC = 27.84\%$. - Confirm calculation of average operating cost percentage. 6. Verification of A4: - Given $I = 44333.33$, $CF = 27500$, and $EIR = 11.34\%$. - Confirm cash flow and interest calculations. 7. Since exact principal, rate, and time values are not provided, the verification is based on the consistency of the given answers with standard formulas. Final answer: The given answers appear consistent with typical financial formulas for interest and rates.