As per given question,
Face Value F = 450,
True discount = 90
As we know the formula,
Present Worth, PW = Face Value ? True Discount
Present Worth, PW = F ? TD = 540 ? 90 = Rs. 450
Hence Simple Interest on 450 = 90 ? ? ? ? ? ? ? ? ? ? ( 1 )
Simple Interest on the face value = Bankers Discount
? Simple Interest on 540
Hence, Simple Interest on 540 = 90/450 × 540 = Rs. 108 = Bankers Discount
T.D. = ?P.W. x B.G.
or B.G. = (T.D.)2/P.W. = (110 X 110) / 1100 = Rs. 11
? B.D. = B.G. + T.D. = Rs. (11 + 110) = Rs. 121
Let TD = N, then BD = 11N/10
Sum = (BD x TD) / (BD - TD) = [(11N/10) x N] / [11N/10 - N]
= [11N2/10] / [N/10] = 11N
SI on ? 11N for 4 yr is ? 11N/10.
? Rate = (100 x 11N/10)/(11N x 4)% per annum
= 2.5% per annum
Face value of the bill = ? 10200
Date on which the bill was drawn = July 14 at 5 Months
Nominally due date = Dec. 14
Legally due date = Dec. 17
Date on which the bill was discounted = Oct. 05
Unexpired time
Oct.-26, Nov. - 30, Dec - 17 = 73 days = 73/365 yr = 1/5 yr
? BD = SI on ? 10200 for 1/5 yr
= (10200 x (10/100) x 1/5)
= ? 204
TD = [10200 x (1/5) x 10] / [100 + 10 x (1/5)]
= (10200 x 2)/102 = ? 200
BG = (BD) - (TD) = (204 - 200) = ? 4
Money received by the holder of the bill = ? (10200 - 204) = ? 9996
Let the sum be Rs. 100. Then, B.D = Rs. 5.
Proceeds = Rs. (100 - 5) = Rs. 95.
? Rs. 5 must be the interest on Rs. 95 for 1 year.
So, rate = (100 x 5) / (95 x 1) = 55/19%
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