Question

Solve the following question.....

1- The compound interest on a sum of money for 2 years is ₹1331.20 and the simple interest on the same sum for the same period and at the same rate is ₹1280. Find the sum and the rate of interest per annum.​

Answer 1

Answer:

8000, 8%

Step-by-step explanation:

Given that CI for 2 years is 1331.20.

Given that S.I for 2 years is 1280.

Difference between C.I and S.I for 2 years = 1331.20 - 1280

                                                                       = 51.2.

Simple Interest for 1 year = 640.

S.I for Rs.640 for 1 year = 51.2.

∴ Rate = (100 * 51.2)/(640 / 1)

           = 8%.

Now,

⇒ P = (SI * 100)/RT

       = (640 * 100)/8

       = 8000.

Therefore:

∴ Sum = 8000.

∴ Rate of interest = 8%.

Hope it helps!

Answer 2

Answer:

Step-by-step explanation:

rate = 2%

1331.2 - 1280 =51. 4

51.4 = 1280 × r×t/100

r =2%

1280 = p × 2 × 2/100

1280 ×25 =p

p=32000