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36.  Rs 240 amounts to Rs 259.2 in 2 years, what will Rs 320 amount to in 4 yrs?


Rs 371.2
Rs 485.2
Rs 365.2
Rs 454.5


Answer

 Option

Interest on Rs 240 in 2 yrs = 259.2 – 240 = 19.2
So interest on Rs 320 = 19.2*(320/240)*(4/2) = 51.2
So amount = 320+51.2

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37.  David invested certain amount in three different schemes A, B and C with the rate of interest 10% p.a., 12% p.a. and 15% p.a. respectively. If the total interest accrued in one year was Rs. 3200 and the amount invested in Scheme C was 150% of the amount invested in Scheme A and 240% of the amount invested in Scheme B, what was the amount invested in Scheme B?


Rs 10000
Rs 8000
Rs 6500
Rs 5000


Answer

 Option

Explanation:-Let x, y and z be the amounts invested in schemes A, B and C respectively. Then,
add individual interest to get total using Si= pxrxt/100
[x x 10 x 1]/100 + [y x 12 x 1]/100 + [z x 15 x 1]/100 = 3200
10x + 12y + 15z = 320000…. (i)Now, z = 240% of y =(12/5)y……… (ii)And, z = 150% of x =(3/2)x so,x=(2/3 )z = (2/3) x value of z from ii
x= (2/3) x (12/5) y = (8/5)y………..(iii)
From (i), (ii) and (iii), we have :
16y + 12y + 36y = 320000
64y = 320000
y = 5000
Sum invested in Scheme B = Rs. 5000

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38.  The SI on a sum of money will be Rs.2500 after 5 years. In the next 5 years Principal is trebled, what will be the total interest at the end of the 10th year?


Rs.15000
None of these
Rs.10000
Rs.20000


Answer

 Option

Trick: (n+1) * x  i.e.  (3+1) *2500
N= No. of times it become
X= SI

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39.  The banker's gain on a sum due 3 years hence at 12% per annum is Rs.270. The banker's discount is?


Rs.960
Rs.840
Rs.1020
Rs.760


Answer

 Option

T.D. = (B.G*100/R*T) = Rs.(270*100/12*3) = Rs.750
Therefore B.D.=Rs.(750+270) = Rs.1020

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40.  The true discount on a bill of Rs.540 is Rs.90. The banker's discount is?


Rs.60
Rs.108
Rs.110
Rs.112


Answer

 Option

P.W. = Rs.(540 - 90) = Rs.450.
Therefore S.I. on Rs.450 =Rs.90
S.I. on Rs.540 = Rs.(90/450*540) = Rs.108
Therefore B.D. Rs.108

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