at what rate %C.I interest per annum will RS 640 amount to RS 774.40 in 2 years
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774.4 = 640 (1 + r/100)^2
7744/6400 = (1 + r/100)^2
square root both sides
88/80 = 1 + r/100
88/80 - 1 = r/100
8/80 = r/100
r = 800/80
r = 10%
yavam:
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