Question

questions
(i) If a principal becomes twice of it in 10 years,
then the rate of simple interest per annum is :
(a) 5%
(b) 10%
(c) 15%
(d) 20%
f he
otion​

Answer 1

Answer:

20percent

Step-by-step explanation:

p=10×2=20

r=20percent

Answer 2

Answer:

∴The correct answer is option(b) 10%

Step-by-step explanation:

Given,

In 10 years, the principal becomes double.

To find,

Rate of simple interest

Recall the concept

Simple Interest, I  = $\frac{PTR}{100}$, P is the principal, T is the time  and R is the rate of interest

Amount A = P + I

Solution:

Given, that the principal becomes double after 10 years

That is A = 2P after ten years

A = P + I

A = P + $\frac{PTR}{100}$

= $P(1+\frac{TR}{100})$

2P =  $P(1+\frac{TR}{100})$

2 = $1+\frac{TR}{100}$

2 -1 =1 =  $\frac{TR}{100}$

TR  = 100

Given T = 10 years

10 R = 100

R = $\frac{100}{10}$ = 10%

∴Rate of interest  = 10%

Hence the correct answer is option(b) 10%

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