Question

a sum of money doubles itself in 5 years at a certain rate of interest. how many years will it takes for a certain sum to become 3 times itself at the same rate of interest.

please answer fast.give answer with explanation do not type unsual words for getting point​

Answer 1

Answer:

ANSWER

let sum=P

Time=2 Years

Amount=2P

According to the question

⇒P(1+

100

r

)

5

=2P

⇒(1+

100

r

)

5

=2

Cubic both side we gets

⇒(1+

100

r

)

15

=8

⇒P(1+

100

r

)

15

=8P

Hence,in 15 Years amount to eight times itself.