Mathmetics
ISBT Mathmetics for all banking PO,Clerk,IBPS PO,Railway,SSC,IAS,OAS Exams
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.
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.
Shortcut method:
x  3x in 3 years
9x i.e. (3x)^{2} = 3 X 2 = 6 years.
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Q2. 

1)  625  2)  630 
3)  640  4)  650 
5)  None of these 
Answer : 625
Explanation : Short Cut Method:
Explanation : Short Cut Method:
Difference X (100)^{2}/ R^{2 }
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Q3. 

1)  Rs. 800  2)  Rs. 850 
3)  Rs. 900  4)  Rs. 1000 
5)  None of these 
Answer : Rs. 900
Explanation :
Explanation :
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Q4. 

1)  Rs. 400  2)  Rs. 500 
3)  Rs. 600  4)  Rs. 800 
5)  None of these 
Answer : Rs. 500
Explanation :
Explanation :
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Q5. 

1)  5%  2)  6% 
3)  8%  4)  10% 
5)  None of these 
Answer : 5%
Explanation :
Explanation :
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Q6. 

1)  30  2)  45 
3)  50  4)  60 
5)  None of these 
Answer : 45
Explanation :
Explanation :
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Q7. 

1)  3%  2)  4% 
3)  5%  4)  6% 
5)  None of these 
Answer : 5%
Explanation :
Explanation :
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Q8. 

1)  625  2)  630 
3)  640  4)  650 
5)  None of these 
Answer : 625
Explanation :
Explanation :
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Q9. 

1)  Rs. 886  2)  Rs.910 
3)  Rs.924  4)  Rs. 954 
5)  None of these 
Answer : Rs.910
Explanation :
Explanation :
Amount = 4400 ( 1+10/100)^{2} = 5324
Therefore,CI = 5324  4400 = 924
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Q10. 

1)  Rs. 1700  2)  Rs. 1500 
3)  Rs. 2057  4)  Rs. 1400 
5)  None of these 
Answer : Rs. 1700
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