Final answer:
To find the rate of interest, we can use the formula for compound interest.
The correct answer is C. 15%
Step-by-step explanation:
The ratio of the principal and the compound interest value for three years (compounded annually) is 216:127. To find the rate of interest, we can use the formula for compound interest:
Future Value = Principal x (1 + interest rate)time
By substituting the values for the principal and compound interest given in the ratio, we can determine the rate of interest.
The correct answer is C. 15%