9. The difference of compound and simple interest on a
certain sum of money is ₹121 at 11%p.a. compounded annually
for 2 years.
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Answer:
compound interest= Amount= P(1+ R/100)n
A= 121(1+11/100)2
A= 121(1/1+ 11/100)2
A=121( 100+11/100)2
A= 121( 110/100)2
A= 121(11/10)2
A= 121×11/10×11/10
A= ₹146.41
Compound interest= Amount-Principle
= 146.41-121
= ₹25.41
simple interest = P×R×T/100
= 121×11×2/100
= ₹26.62
Difference= Compound interest - simple interest.
= 26.62 - 25.41
= ₹1.21=Answer
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