Aptitude  Simple Interest
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 Simple Interest  Formulas
 Simple Interest  General Questions
 Simple Interest  Data Sufficiency 1
 Simple Interest  Data Sufficiency 2
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.
Let the sum invested in Scheme A be Rs. x and that in Scheme B be Rs. (13900  x).
Then,  x x 14 x 2  +  (13900  x) x 11 x 2  = 3508  
100  100 
28x  22x = 350800  (13900 x 22)
6x = 45000
x = 7500.
So, sum invested in Scheme B = Rs. (13900  7500) = Rs. 6400.
Video Explanation: https://youtu.be/Xi4kU9y6ppk
Principal 




= Rs. 8925. 
Let rate = R% and time = R years.
Then,  1200 x R x R  = 432  
100 
12R^{2} = 432
R^{2} = 36
R = 6.
Video Explanation: https://youtu.be/TjjI4iRkzT0