Question:To find out the total compound interest accrued on a sum of money after `5` years, which of the folloeing informations given in the statements P and Q will be sufficient ?

p: The sum was Rs.`2000`

Q: The total amount of simple interest on the sum after `5` years was Rs. `4000`. 

A only P is sufficient 
B onlly Q is sufficient 
C Either P or Q is sufficient 
D Both P & Q are needed 
E Both P & Q are not sufficient 

+ Answer
D 

+ Explanation
Clearly, both A and Q are needed.

Using P and Q, rate can be calculated as

Rate`= ((100 xx 4000)/(5 xx 2000))`

`= 4%`

Now, C.I. can be calculated.

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Irin Moni

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