Mathmetics
ISBT Mathmetics for all banking PO,Clerk,IBPS PO,Railway,SSC,IAS,OAS Exams
Q21. 

1)  Rs.805.75  2)  Rs.804.75 
3)  Rs.810  4)  Rs.850 
5)  None of these 
Answer : Rs.804.75
Explanation :
Explanation :
Interest at the end of the first year + Interest at the end of the second year
= Total interest at the end of the two year period is
= ( 5000 x 1 x7) /100 + (5350 x 1 x 8.5 ) /100 = 350 + 454.75 = Rs. 804.75
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Q22. 

1)  5%  2)  6% 
3)  5.5%  4)  7% 
5)  None of these 
Answer : 5%
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Q23. 

1)  Rs. 4462.50  2)  Rs. 8032.50 
3)  Rs. 8900  4)  Rs. 8925 
5)  None of these 
Answer : Rs. 8925
Explanation :
Explanation :
Principal = (100 x 4016.25 ) / ( 9 x 5) = Rs. 8925.
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Q24. 

1)  Rs. 650  2)  Rs. 690 
3)  Rs. 698  4)  Rs. 700 
5)  None of these 
Answer : Rs. 698
Explanation :
Explanation :
S.I. for 1 year = Rs. (854  815) = Rs. 39.
S.I. for 3 years = Rs.(39 x 3) = Rs. 117.
Principal = Rs. (815  117) = Rs. 698.
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Q25. 

1)  Rs. 800  2)  Rs. 900 
3)  Rs. 1100  4)  Rs. 870 
5)  None of these 
Answer : Rs. 900
Explanation :
Explanation :
Let the sum lent at 8% be Rs. x and that at 6% be
Rs. (1550  x).
or (X x 8 x 1/100 ) + [ {(1500 X) x 6 x 1}/ 100 ] = 106
or 8 x + 9300  6 x = 10600
or 2 x = 1300
or x = 650
Money lent at 8% = Rs.650.
Money lent at 6% = Rs(1550  650) = Rs. 900
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Q26.  A sum was put at S.I. at certain rate for 5 years. Had it been put at 4% higher rate, it would have fetched Rs. 60 more. What was the sum ? 
1)  Rs.280  2)  Rs.300 
3)  Rs.320  4)  Rs.400 
5)  None of these 
Answer : Rs.300
Explanation :
Explanation :
Let Principal =P, Rate of Interest = R
Given, T = 5 So, (P x 5 x R) / 100
Now new rate of interest =( R+ 4) %
So, S.I. = {P x 5 x (R+ 5%) } / 100
Then, {P x 5 x (R+ 5%) } / 100  (P x 5 x R) / 100 = 60
or P /60 = 5 or P= Rs. 300
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