Final answer:
The interest rate on the $1500 loan is 16%.
Step-by-step explanation:
To determine the interest rate, we need to divide the amount of interest paid by the loan amount and then multiply by 100 to get the percentage.
Step 1: Divide $240 by $1500: $240 / $1500 = 0.16
Step 2: Multiply the result by 100 to get the percentage: 0.16 × 100 = 16%
Therefore, the interest rate is 16% (option d).