In how many years will Rs 1600 amount to Rs 1852.20 at 5% per annum when compounded annually?
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Answer:
20
Given A = 1852.20, P = 1600, R = 5%.
We know that A = P(1 + r/100)^n =
1852.20 = 1600(1 + 5/100)^n
1852.20 = 1600(105/100)^n
1852.20 = 1600(1.05)^n
1852.20/1600 = (1.05)^n
1.157625 = (1.05)^n
(1.05)^3 = (1.05)^n
n = 3.
Therefore in 3 years the rupees 1600 amount to rupees 1852.20 at 5% P.A.
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