find the amount and the CI on rupees 12800 for 1 year at 7 whole 1 by 2% per annum compounded semiannually
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P=12800
T=1 yr but = 2( semiannually compounded) n=2
R= 7 1/2= 15/2=15/2×1/2=15/4
A= P(1+r/100)^ n
= 12800(1+15/100×4)²
= 12800 × 415/400 × 415/400
= 12800× 83/80 × 83/80
= 13778
CI = 13778-12800
=978
Hence A = 13778 and CI = 978
T=1 yr but = 2( semiannually compounded) n=2
R= 7 1/2= 15/2=15/2×1/2=15/4
A= P(1+r/100)^ n
= 12800(1+15/100×4)²
= 12800 × 415/400 × 415/400
= 12800× 83/80 × 83/80
= 13778
CI = 13778-12800
=978
Hence A = 13778 and CI = 978
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