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. of Rs. 901 due 9 months hence at 8%
= Rs { (100 x 901) / (100 + (8 x 3 / 4))} = Rs. (100 x 901) / 106
= Rs. 850
Since T.D. is S.I. on Rs. P.W.,
we have Rs. (810 - 750) or Rs. 60 as S.I. on Rs. 750 for 2 years
? Rate = (100 x 60) / (750 x 2) = 4%
R = (100 x T.D.) / (P.W. x T) = (100 x T.D.) / [(A - T.D.) x T]
= (100 x 60) / (1800 x 3) [ since P.W. = A - T.D.]
= 10%
? The rate per cent is 10% per annum
S.P. = (102% of Rs. 600) = Rs. (102/100) x 600 = Rs. 612
? P.W. of Rs. 650.25 due 9 months later is Rs. 612.
? Rs. 38.25 is S.I. on Rs. 612 for 9 months
? Rate = (100 x 38.25) / (612 x 3/4)% = 81/3%
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
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.
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%
Required sum = (100 x 5300) / {(100 + (3/2) x 4)}
= (100 x 5300) / 106 = Rs. 5000
P.W. = Rs. (2575 - 75) = Rs. 2500
? Rate = (100 x 75 x 3) / (2500 x 1)% = 9%
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