Final answer:
Using the simple interest formula I = PRT, Joe would have paid $2940 in interest over six years on a $7000 loan with a 7% annual interest rate.
Step-by-step explanation:
To calculate the interest paid on a loan using simple interest, we use the formula I = PRT, where I is the interest, P is the principal amount borrowed, R is the annual interest rate (as a decimal), and T is the time in years. Applying this formula to Joe's loan:
I = PRT
I = $7000 × 0.07 × 6
I = $2940
Therefore, Joe paid $2940 in interest over six years. So, the correct answer is a. Joe paid $2940 in interest over six years.