Final answer:
The simple interest rate per annum needed for $25,000 to grow to $33,000 in 5 years is closest to 6%, which is choice B. This is calculated using the formula for simple interest and solving for the rate.
Step-by-step explanation:
To find the simple interest rate per annum required for $25,000 to accumulate to $33,000 in 5 years, you can use the formula for simple interest: I = PRT, where I is the interest, P is the principal amount, R is the rate of interest per annum, and T is the time in years. In this case, the interest I earned is $33,000 - $25,000 = $8,000, the principal P is $25,000, and the time T is 5 years. Plugging these values into the formula: $8,000 = $25,000 × R × 5. Solving for R: R = $8,000 / ($25,000 × 5) = 0.064 or 6.4%. Therefore, the closest interest rate that would allow the money to accumulate to $33,000 in 5 years is 6% per annum, which is choice B.