1. Find the time in which a sum of money gets doubled at the interest rate of 8% per annum
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Answer : Let the principal ( P ) = 3100 ..
Amount ( A ) = 100 x 2 = 3200
. : . S.I. = A - P = * 200 - 100 = 100 Rate ( R ) = 8 % p.a. .. Time = ( S.I. * 100 ) / ( PR ) = ( 100 x 100 ) / ( 100 8 ) = 25/2 = 12.1 / 2 Years
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