Question

a man borrowed some money from the bank at bank at 10 % per annum simple interest for 5 years . he paid back rs. 3600 to the bank and settled the account.what sum did he borrow from the bank

Answer 1

Let the sum be p
Rate 10%
Time 5 yrs
Amount 3600
S.I=Amount-principle
3600-p
3600-p=p*10*5/100
3600-p=p/2
2(3600-p)=p
7200-2p=p
7200=3p
p=2400

Principle=2400

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Answer 2

let the principal =x
rate=10%
time=5 years
amount=₹3600
S.I.=A-P
=3600-x
S.I. = P ×T×R/100
3600-x= x*5*10/100
3600-x= x/2
3600=x/2+x
3600= 3 x/2
x=3600*2/3
x= 7200/3
=2400
so,principal is ₹2400.
I hope it will helps you.