AMO · 2027 · Grades 6-7 · Self-study SET 28 Question 13

The interest on 1200 dollars exceeds the interest on 1000 dollars by 30 dollars over 3 years. Find the annual interest rate. Both deposits use the same rate and interest model, but the question does not specify simple interest or compounding. For this question, do not assume an unstated model; decide whether the information determines a unique annual rate.

**Input:** Choose one option.