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Question

Find the principal of the interest compounded annually at the rate of 10% for two years is Rs. 210.


Solution

Let principal (P) = Rs. 100
Rate (R) =10% p.a
Period (n) = 2 years
C.I =P[(1+R100)n1]
=Rs.100[(1+10100)21]
=Rs.100[(1110)21]=Rs.100[1211001]
=Rs.100(121100100)=Rs.21
If C.I is Rs. 21, then principal = Rs. 100
If C.I is Re. 1, then principal =Rs.10021
and if C.I is RS. 210, then principal
=Rs.10021×210=Rs.1000


Mathematics
RD Sharma
Standard VIII

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