Question

14. If the amounts of two consecutive years on a
sum of money are in the ratio 20 : 21, find
the rate of interest.​

Answer 1

$\bf\red{Given:-}$

ratio = 20:21

$\bf\red{To \: Find:-}$

The rate of interest.

$\bf\red{The \: first \: year:-}$

The amount for the end of the first year will be the principle of 2nd year = = 21x - 20x = 1x

$\bf\red{Use \: \: Formula:-}$

Interest = PRM / 100

$\bf\red{Solution:-}$

$x = \frac{20 \times r1}{100}$

= 100 = 20 R

= R = 5%

$\bf\red{More \: Formula:-}$

• Simple Interest= p × r × t

• A = P ( 1 + r/n) ^ 2