Multiple choice

What is the ratio of the simple interest earned on a certain amount at the rate of 21% per annum for 8 years to that earned on the same sum at the same rate for 21 years?

  1. 8 : 21

  2. 21 : 5

  3. 5 : 21

  4. 21 : 8
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Simple interest is directly proportional to time when the principal and rate are constant. The ratio of interest for 8 years to 21 years is simply the ratio of the time periods, which is 8:21.

AI explanation

Using the Simple Interest formula, the interest earned is directly proportional to the time period when the principal and rate are constant. The ratio of the interest for 8 years to the interest for 21 years is simply the ratio of their respective time periods. This means the ratio is 8 to 21. The result is 8 : 21.

Keep practicing — related questions