Question

1.
Choose the correct option in each case from the following
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%​

Answer 1

$\huge{\green{\fbox{\red{Answer}}}}$

Given ,

• Time = 10 years
• Let principal = p
• amount = 2(principal) = 2p
• rate of interest = ?
• Interest = amount - principal
• interest = 2p-p = p

$\large{\orange{\fbox{\blue{Note}}}}$

• $I=\dfrac{PTR}{100}$

• $p=\dfrac{p(10)R}{100}$

• $1=\dfrac{R}{10}$

• R = 10%

$\red{\fbox{\green{\therefore .R=10}}}$