Required sum = (100 x 5300) / {(100 + (3/2) x 4)}
= (100 x 5300) / 106 = Rs. 5000
P.W. of Rs. 360 due 2 years hence at 71/7% per annum
= Rs. { {100 x 360} / {100 + (50/7 x 2)}}
= Rs. { (100 x 360 x 7) / 800} = Rs. 315
? S.P. = Rs. 315
Hence, gain % = (15 x 100) / 300 = 5%
P.W. of Rs. 1120 due 2 years hence at 6%
= Rs. [{100 x 1120} / {100 + (6 x 2)}] = Rs. 1000
P.W. of Rs. 1081.50 due 6 months hence at 6%
= Rs. [ {100 x 1081.50} / {100 + (6 x 1/2)} ]
= Rs [ (100 x 1081.50) / 103 ] = Rs. 1050
So, A owes B, Rs. 1000 cash and B owes A Rs. 1050 cash.
? B must pay Rs. 50 to A.
S.I. on Rs. 240 for a given time = Rs. 20
S.I. on Rs. 240 for half the time = Rs. 10
? Rs. 10 is T.D. on Rs. 250
So, T.D. on Rs. 260 = Rs. (10 / 250) x 260 = Rs. 10.40
A has to pay the P.W. of Rs. 220 due 1 year hence, which is
= Rs. [ (100 x 220) / {100 + (10 x 1)} ] = Rs. 200
A, actually pays = Rs. [110 + P.W. of Rs. 110 due 2 years hence]
= Rs. [ 110 + (100 x 110) / {100 + (10 x 2)} ]
= Rs. [110 + 91.66] = Rs. [201.66]
? A loses = Rs. [200 - 201.66] = Rs. 1.66
P.W. of Rs. 8285 due 6 months hence = Rs. { (100 x 8250) / {100 + (25 / 4 x 1 / 2)} } = Rs. 8000
? Rs. 8100 in cash is a better offer.
P.W. = Rs. (2575 - 75) = Rs. 2500
? Rate = (100 x 75 x 3) / (2500 x 1)% = 9%
P.W. = (100 x 176) / (100 + (6 x 20)/12) = Rs. 160
T.D. = Amount - present worth
= Rs. 176 - Rs. 160 = Rs. 16
P.W. = (Sum due) - (T.D.)
= Rs. (1860 - 60) = Rs. 1800
Thus, Rs. 60 is S.I. on Rs. 1800 at 5% per annum
? Time = (100 x 60) / (1800 x 5) years
= 2 / 3 years = 8 months
P.W. = (100 x T.D.) / (R x T) = (100 x 240) / (12 x 8/12) = Rs. 3000
? P.W. is Rs. 3000
? A = Amount of bill = P.W. + T.D. = 3000 + 240 = 3240
? 15 = [A x (4 x 1/2)2] / [100(100 + 4 x 1/2)]
? 15 = (A x 4) / (100 x 102)
? A = 15 x 25 x 102
? A = Rs. 38, 250.
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