Question

and x = 40 then y=16 , it x = 4
then = ?​

Answer 1

Answer:

Your question is incomplete.

Step-by-step explanation:

Given :-

Simple Interest => ₹40

Rate => 5%

Time => 2 years

To Find :-

Compound Interest on same thing

Solution :-

As we know that

$\sf \: Principal = \dfrac{ SI \times 100}{Rate \times Time}$

$\sf \: Principal = \dfrac{40 \times 100}{5 \times 2}$

$\sf \: Principal = \dfrac{4000}{10}$

$\sf \: Principal = 400$

Now,

$\sf \: A = P \bigg(1 + \dfrac{R}{100} \bigg)^{n}$

$\sf \: A =400 \bigg(1 + \dfrac{5}{100} \bigg)^{2}$

$\sf \: A \: = 400 \bigg( \dfrac{100 + 5}{100} \bigg)^{2}$

$\sf \: A = 400 \times \dfrac{105}{100} \times \dfrac{105}{100}$

$\sf \: A = 400 \times \dfrac{21}{20} \times \dfrac{21}{20}$

$\sf \: A = \dfrac{176,400}{400}$

$\sf \: A = 441$

Now,

Finding

$\sf \: CI = Amount - Principal$

$\sf \: CI =441 - 400$

$\fbox{CI =41}$