S.I. = Rs  ❨  1200 x 10 x 1  ❩  = Rs. 120. 
100 
C.I. = Rs.  [  1200 x  ❨  1 +  5  ❩  2   1200  ]  = Rs. 123. 
100 
∴ Difference = Rs. (123  120) = Rs. 3.
Sum = Rs.  ❨  50 x 100  ❩  = Rs. 500. 
2 x 5 
Amount 




= Rs. 551.25 
∴ C.I. = Rs. (551.25  500) = Rs. 51.25
Amount 




= Rs. 8820. 
Amount of Rs. 100 for 1 year when compounded halfyearly 
]  = Rs.  [  100 x  ❨  1 +  3  ❩  2  ]  = Rs. 106.09 
100 
∴ Effective rate = (106.09  100)% = 6.09%
Amount 




= Rs. 35123.20 
∴ C.I. = Rs. (35123.20  25000) = Rs. 10123.20
Then,  [  P  ❨  1 +  10  ❩  2   P  ]  = 525 
100 
⟹  P  [  ❨  11  ❩  2   1  ]  = 525 
10 
⟹ P =  ❨  525 x 100  ❩  = 2500. 
21 
∴ Sum = Rs . 2500.
So, S.I. = Rs.  ❨  2500 x 5 x 4  ❩  = Rs. 500 
100 
Then, 1200 x  ❨  1 +  R  ❩  2  = 1348.32 
100 
⟹  ❨  1 +  R  ❩  2  =  134832  =  11236 
100  120000  10000 
∴  ❨  1 +  R  ❩  2  =  ❨  106  ❩  2 
100  100 
⟹ 1 +  R  =  106 
100  100 
⟹ R = 6%
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. 3321. 
P  ❨  1 +  20  ❩  n  > 2P  ⟹  ❨  6  ❩  n  > 2. 
100  5 
Now,  ❨  6  x  6  x  6  x  6  ❩  > 2. 
5  5  5  5 
So, n = 4 years.
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