Principal (P)=Rs.4000
Rate of Interest (r)=10%
Time =2 years and 3 months
Here first we take n=2 years.
⇒ Amount for first 2 years (A)=P(1+r100)n
=4000(1+10100)2
=4000(1110)2
=4000×121100
=Rs.4840
⇒ The amount after two years =Rs.4840
⇒ Now, Principal =Rs.4840
Simple interest for last 3 months i.e. 14years =PRT100
=4840×10×1100×4
=Rs.121
⇒ Amount after 2 years and 3 months =Rs.4840+Rs.121=Rs.4961
⇒ C.I.=A−P
=Rs.4961−Rs.4000
=Rs.961
∴ The compound interest is Rs.961