Question

12. A sum of money becomes four times in 20 years at St. Find the rate of Interest.
(a) 20 % (b) 15 % (c) 12 % (d) 12.5% (e) 16 %​

Answer 1

Answer:

c

Explanation:

a sum of money becomes four times in 20 years at St find the rate of interest is 12%

Answer 2

Answer:

15%...

Explanation:

Let rate of interest be r%.

principal = x

Time =20 years

As per qn.

Amount = 4x (after 20 yrs)

SI= Amount-Principal

SI=4x-x

SI= 3x

SI=(prt)÷100

3x=(x*r*20)÷100

on solving we get

r=15%