Discussion :: Simple Interest

What percentage of simple interest per annum did Anand pay to Deepak?
I. Anand borrowed Rs. 8000 from Deepak for four years.
II. Anand returned Rs. 8800 to Deepak at the end of two years and settled the loan.
A.
I alone sufficient while II alone not sufficient to answer 

B.
II alone sufficient while I alone not sufficient to answer 

C.
Either I or II alone sufficient to answer 

D.


E.
Both I and II are necessary to answer 
Answer : Option A
Explanation :
Let the rate be R% p.a.
I gives, P = Rs. 8000 and T = 4 years.
II gives, S.I. = Rs. (8800  8000) = Rs. 800.
R =  \([\frac { 100*S.I } {P.T } ]\)  =  \([\frac { 100*800 } { 8000*4 }]\)  %= 2\(\frac { 1 } { 2 } \)  % p.a.  
Thus, I and II both are needed to get the answer
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