Mathmetics

ISBT Mathmetics for all banking PO,Clerk,IBPS PO,Railway,SSC,IAS,OAS Exams

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Q1.
A some of money at compound interest amounts to thrice itself in three years. In how man years will it be nine times itself ? 
1) 4 years 2) 6 years
3) 8 years 4) 12 years
5)None of these
Answer : None of these
Explanation : Let, principal be x.It will be 3x after  years.
9x will takes another 3 years.
So,total time taken= 3+3 = 6 years.


Short-cut method:

x     ------  3x in 3 years 
9x i.e. (3x)2   = 3 X 2 = 6 years. 
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Q2.
The difference between simple interest and compound interests compounded annually on a certain sum of money for 2 years at 4% per annum is Re. 1. What is The sum (in Rs.) ?
1) 625 2) 630
3) 640 4) 650
5)None of these
Answer : 625
Explanation : Short -Cut Method:

Difference X (100)2/ R


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Q3.
A sum of Rs. 1550 is lent out into two parts, one at 8% and another one at 6%. If the total annual income is Rs. 106, find the money lent at each rate ? (Bank PO, 2005).
1) Rs. 800 2) Rs. 850
3) Rs. 900 4) Rs. 1000
5)None of these
Answer : Rs. 900
Explanation :
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Q4.
The compound interest on a certain sum for 2 years at 10% per annum is Rs. 525. The simple interest on the same sum for double the time at half the rate percent per annum is: (Bank PO , 2008)
1) Rs. 400 2) Rs. 500
3) Rs. 600 4) Rs. 800
5)None of these
Answer : Rs. 500
Explanation :
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Q5.
A sum of money invested at compound interest amounts in 3 years Rs. 2400 and in 4 years to Rs. 2520. The interest rate per annum is -- (Bank PO, 2003)
1) 5% 2) 6%
3) 8% 4) 10%
5)None of these
Answer : 5%
Explanation :
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Q6.
A sum of money doubles itself at compound interest in 15 years. In how many years will it become eight times ?
1) 30 2) 45
3) 50 4) 60
5)None of these
Answer : 45
Explanation :
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Q7.
The Compound interest on a certain sum for 2 years is Rs. 410 and simple interest is Rs. 400. The rate of interest per annum is - (Bank PO, 2007)

1) 3% 2) 4%
3) 5% 4) 6%
5)None of these
Answer : 5%
Explanation :
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Q8.
The difference between simple and compound interests compounded annually on a certain sum of money for 2 years at 4% per annum is Re. 1. The sum (in Rs.) is:
1) 625 2) 630
3) 640 4) 650
5)None of these
Answer : 625
Explanation :
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Q9.
What would be the compound interest obtained on an amount of Rs.4400 at the rate of 10% p.a. after 2 years ?
1) Rs. 886 2) Rs.910
3) Rs.924 4) Rs. 954
5)None of these
Answer : Rs.910
Explanation :
Amount = 4400 ( 1+10/100)2 = 5324
Therefore,CI = 5324 - 4400 = 924
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Q10.
Rs. 3757 is to be divided between A and B such that A’s share at the end of 7 years may be equal to B’s share at the end of 9 years. If rate percent be 10% p.a. compound Interset, B’s share is -
1) Rs. 1700 2) Rs. 1500
3) Rs. 2057 4) Rs. 1400
5)None of these
Answer : Rs. 1700
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