Answer: To find the interest rate, we can use the formula:
Interest = Principal * Rate * Time
where Principal = $7400, Interest = $2220, and Time = 4 years.
Rearranging the formula, we have:
Rate = Interest / (Principal * Time)
Substituting the given values, we get:
Rate = $2220 / ($7400 * 4)
ate = 0.075
Converting to percent form, the interest rate would be 7.5%.