Question

Monthly interest for 1000 rupees is 20 rupees only
a) What is the interest of 100 rupees for one month ?
b) What is the rate of interest ?

please give me answers​

Answer 1

Interest of Rs.100  = Rs.2/-

$\bold{r = 2\%}$

Step-by-step explanation:

Given,

Principal = 1000

Simple interest for one month = Rs.20/-

(a). Interest of 100 rupees for one month is

Interest of Rs. 1000 = Rs.20

Then,

Interest of Rs.100 = $\frac{20}{1000}\times 100$

Interest of Rs.100  = Rs.2/-

(b). $SI = \frac{p\times r\times t}{100}$

$20 = \frac{1000\times r\times 1}{100}$

$r = \frac{100\times 20}{1000}$

$\bold{r = 2\%}$

Answer 2

Simple interest on Rs 100 = Rs 2 and Rate of interest = 2 % Per month or 24 % per annum

Step-by-step explanation:

Monthly interest for 1000 rupees is 20 rupees only

P = 1000

SImple Interest = 20 Rs

Rate of Interest  = R % per month

Time  = 1 Month

SI = P * R * T /100

=> 20 =  1000 * R * 1 /100

=> R = 2

Rate of interest = 2 % Per month

or 24 % per annum

SI on rs 100

SI = 100 * 2 * 1 /100

=> SI = 2 Rs  for 100 Rs

Simple interest on Rs 100 = Rs 2

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