Question

if the simple interest on a sum at 4%per annum for 2 years is 80 rs then the compound interest on the same sum for the same period is

Answer 1

HEY DEAR ...

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Let take x as principal 
SI = (PNR/100)
80 = (x × 2× 4 /100)
80×100/4×2= x 
1000= x = principal
Find CI 
=[1000(1+4/100)^2]
=1000×26/25×26/25
=1081.6 
CI=(1081.6-1000)=81.6 Rs 

HOPE , IT HELPS ...

Answer 2

Just apply the formula of compound intrest
P=(1+R/100)
YOU WILL GET YOUR ANSWER