Question

at a certain rate of interest the interest after 4 years on 5000 rupees principal is 1200 rupees what will be the interest on 15000 rupees at the same rate of interest for the same period?

Answer 1

Answer: The interest on 15000 rupees at the rate of 6% per annum would be Rs 3600.

Step-by-step explanation:

Given that,

P= Rs 5000

I= 1200

T= 4 yrs

The formula of simple interest is given by:

I= P*R*T/100

Putting all the given values in the above equation, we get:

1200= 5000*R*4/100

1200= 200*R

R= 1200/200=6

So,

R=6%

Using the same formula of simple interest for principle 15000

I= P*R*T/100

I= 15000*6*4/100=3600

Answer 2

Answer:

Rs 3600

Step-by-step explanation:

Find the interest earned for 1 year:

4 years = Rs 1200

1 year = 1200 ÷ 4 = Rs 300

Find the interest rate:

Interest rate = interest/principal x 100

Interest rate = 300/5000 x 100 = 6%

Find the interest for 1 year on Rs 15000:

1 year interest = 6% of Rs 15000

1 year interest = 006 x 15000 = Rs 900

Find the interest for 4 years on Rs 15000:

1 year = Rs 900

4 years = 900 x 4 = Rs 3600

Answer: The interest is Rs 3600