S.I on Rs. (110 - 10) for a given time = Rs. 10
S.I. on Rs. 100 for double the time = Rs. 20
Sum = Rs. (100 + 20) = Rs. 120
T.D. on Rs. 110 = Rs. (20/120) x 110 = Rs. 18.33
? P.W. = 39.69 / (1 + 5 / 100)2
= (3969 x 100 x 100) / (100 x 105 x 105) = Rs. 36
? True discount = Rs. 39.69 - 36 = Rs. 3.69
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