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16.
The compound interest of Rs. 20480 at 6 1 % per annum for 2 years 73 days is -    
4    
  • A.
    Rs. 3000
  • C.
    Rs. 2929
  • B.
    Rs. 3131
  • D.
    Rs. 3636
  • Answer & Explanation
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Answer : [C]
Explanation :
 
  C.I. = Rs. 20480 x
1 + 25
4 x 100
2  
1 + 1 x 25
5 4 x 100
 - 20480      
       
 
   = Rs.
20480 x 17 x 17 x 81
16 16 80
 - 20480    
     
 
   = 20480
23409 - 20480
20480
   
     
 
   = Rs. 2929      
 
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17.
If the compound interest on a certain sum for 2 years in Rs. 60.60 and the simple interest Rs. 60; then the rate of interest per annum is
  • A.
    2%
  • C.
    4%
  • B.
    3%
  • D.
    None of these
  • Answer & Explanation
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Answer : [A]
Explanation :
 
  We have,  
 
  C.I. - S.I. = R x S.I.
 
60.60 - 60 =  R x 60  
200 200  
 
     
 
 R = 0.60 x 200  = 2%  
60  
 
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18.
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:
  • A.
    Rs. 400
  • C.
    Rs. 600
  • B.
    Rs. 500
  • D.
    Rs. 800
  • Answer & Explanation
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Answer : [B]
Explanation :
 
Let the sum be Rs. P. Then,
 
 
 
  p
  1 + 10   2
100
- P    = 525    
 
 
 
P  
  11   2
10
 - 1    = 525    
 
 
 
P =
  525 x 100  
21
 = 2500.    
 
 
 Sum = Rs. 2500.  
 
So, S.I. = Rs.   2500 x 5 x 4    = Rs. 500      
100      
 
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19.
The compound interest on a sum for 2 years is Rs. 832 and the simple interest on the same sum for the same period is Rs. 800. The difference between the compound and simple interest for 3 years will be -
  • A.
    Rs. 48
  • C.
    Rs. 98.56
  • B.
    Rs. 66.56
  • D.
    None of these
  • Answer & Explanation
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Answer : [C]
Explanation :
 
S.I. for first year = Rs. 400
 
S.I. on Rs. 400 for 1 year = Rs. 32
 
 
 
  Rate = 100 x 32  = 8%  
400 x 1  
 
Hence, the difference for 3rd year is S.I. on Rs. 832
 
  = Rs. 832 x 8  
100  
 
  = Rs. 66.56  
 
 
 
 Total difference = Rs. (32 + 66.56)    
 
  = Rs. 98.56  
 
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20.
On a certain sum of money, the simple interest for 2 years is Rs. 200 at the rate of 7% per annum. Find the difference in C.I. and S.I.
  • A.
    Rs. 7
  • C.
    Rs. 11
  • B.
    Rs. 9
  • D.
    None of these
  • Answer & Explanation
  • Report
Answer : [A]
Explanation :
 
  We ave,  
 
  C.I. S.I. = R x S.I. = 7 x 200    
200 200    
 
  [Here, R = 7 and S.I. = 200]  
 
  Rs. 7  
 
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