31.  The difference between CI and SI on the same sum for 2 yrs at the rate of 25% pa is Rs.1500. What is the principal lent out in each case?


Rs.24000
Rs.23000
Rs.21000
Rs.18000


Answer

 Option

P(r/100)2 = 1500 P(25/100) 2 = 1500 P*1/16 = 1500 P = 1500*16 = 24000

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32.  At what percent per annum will a sum of money triple in 16 years?


11(1/2)%
12(1/2)%
12%
10%


Answer

 Option

P = P, SI=2P, T=16 Rate= 100*2P/P*16

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33.  A part of 2000 is lent at 6% per annum and rest sum is lent at 8% per annum. If total interest earned after 4 years is 500. Then the sum lent at 8%.?


550
450
350
250


Answer

 Option

Let sum lent at 8% is X 500 = X*(8/100)*4 + (2000-X)*(6/100)*4

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34.  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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35.  Rs 1200 becomes Rs 1632 after 4 years. If the rate of interest is increased by 2%, what will be the amount then?


Rs 1,844
Rs 1,728
Rs 1,756
Rs 1,890


Answer

 Option

Increase in interest in 4 yrs with rate 2%= 1200*4*2/100 = 96 So amount = 1632+96 = 1728

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