Q:

A sum of money becomes two times of itself in 8 years at simple interest, and it becomes four times of itself in 2 years at compound interest, when interest is compounded annually. Find the ratio of the rate of simple interest to the rate of compound interest offered per year.

• 1
  2 : 3
• 2
  3 : 5
• 3
  5 : 3
• 4
  1 : 8