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Anirudh from 989820Delhi Pubic school Rohini , Delhi
Subject :IMO    Class : Class 8

The difference between the compound interest and simple interest on a certain sum of money at 10% per annum for 2 years is ₹ 500. Find the sum when the interest is compounded annually.

A ₹ 50000
B ₹ 55000
C ₹ 40000
D ₹ 65000


b

Ans 1:

ARAVINDAN MANIKANDAN from NPS INternational, Singapore
Class : Class 8

Ans 2:

Anshuman D from MVM, Hyderabad
Class : Class 9
Let the sum be x. Compound interest: P(1+r/100)^n-P =x(11/10)^2-x Taking x common, x[(121/100)-1] =21x/100 Simple interest:p*r*t/100 =x*10*2/100 =x/5 Compound interest - simple interest =500 21x/100-x/5=500 x/100=500 x=50000

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