In a particular time, a sum becomes 4 times of itself on simple interest at the rate of 10% per annum. What is the rate of interest if the same sum becomes 7 times of itself in the same duration?
Answer & explanation
Correct answer: option 2
Principal : Amount : S.I. ⇒ Rate
4 times ⇒ 1 : 4 : 3 ⇒ 10%
⇓ ×2 ⇓ ×2
7 times ⇒ 1 : 7 : 6 ⇒ 20%