Find the simple interest earned on an investment of $4,000 was $216. Find the interest rate.

100(216 / 4,000) = ?

2000

To find the interest rate, we can use the formula for simple interest:

Simple Interest = (Principal * Rate * Time) / 100

Given that the principal (P) is $4,000, the simple interest (I) is $216, and the time (T) is not mentioned, we will solve for the rate (R).

Rewriting the formula, we have:

216 = (4000 * R * T) / 100

To further solve for R, we need to know the time period (T) or the number of years the money was invested for. Can you provide the time period?

To find the interest rate, we can use the formula for calculating simple interest:

Simple Interest = (Principal * Rate * Time) / 100

In this case, the principal is $4,000 and the simple interest is $216. We want to find the interest rate (Rate). We can rearrange the formula to solve for the interest rate:

Rate = (Simple Interest * 100) / (Principal * Time)

Plugging in the values we have:
Rate = (216 * 100) / (4,000 * Time)

To determine the exact interest rate, we need to know the time period (Time). Could you please provide the duration of the investment?