Aptitude  Compound Interest
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 Compound Interest  Formulas
 Compound Interest  General Questions
 Compound Interest  Data Sufficiency 1
 Compound Interest  Data Sufficiency 2
 Compound Interest  Data Sufficiency 3.1
Amount 








= Rs. 3321. 
C.I. = Rs. (3321  3200) = Rs. 121
Let the sum be Rs. x. Then,
C.I. =  x  1 +  4  2   x  =  676  x   x  =  51  x.  
100  625  625 
S.I. =  x x 4 x 2  =  2x  .  
100  25 
51x    2x  = 1  
625  25 
x = 625.
Let P = Rs. 100. Then, S.I. Rs. 60 and T = 6 years.
R =  100 x 60  = 10% p.a.  
100 x 6 
Now, P = Rs. 12000. T = 3 years and R = 10% p.a.
C.I. 




= 3972. 
C.I. when interest compounded yearly 




= Rs. 5304. 
C.I. when interest is compounded halfyearly 




= Rs. 5306.04 
Difference = Rs. (5306.04  5304) = Rs. 2.04
Amount = Rs. (30000 + 4347) = Rs. 34347.
Let the time be n years.
Then, 30000  1 +  7  n  = 34347  
100 
107  n  =  34347  =  11449  =  107  2  
100  30000  10000  100 
n = 2 years.