Question

if a certain amount of money doubles in 5 years, the rate of interest p.c.p.a. G is (B) 10 ((A) 5 (C) 25 (D) 20 ​

Answer 1

Given :-

If a certain amount of money doubles in 5 years,

To Find :-

Rate

Solution :-

Let the principal be x

Amount = 2x

SI = A - P

SI = 2x - x

SI = x

Let rate be R

R = 100 × SI/P × T

R = 100 × x/x × 5

R = 100/5

R = 20%

Therefore,

Option D is correct

Answer 2

Answer:

$\underline{\purple{\ddot{\Mathsdude}}}$

To find:-

• Rate of interest.

Explanation :-

Let,

• The principle be as x

• Amount =2x

SI = Amount - Principle

SI= 2x-x

SI =x.

Let rate be R.

• R=100×SI/P×T
• R= 100/5

• R=20%.

Option D is the correct answer for your question..

Thank you.

Hope it helps u mate.