The average monthly income of P and Q is Rs. 5050. The average monthly income of Q and R is 6250 and the average monthly income of P and R is Rs. 5200. The monthly income of R is?	Choose the correct option.
A) A)Rs.4078	B) B)Rs.4000	C) C)Rs.4029	D) D)Rs.4027	E) E)Rs.6400
Let P, Q and R represent their respective monthly incomes. Then, we have:   P + Q = (5050 * 2)= 
<gadget id="calculator">(5050 * 2)</gadget>
<output>10_100</output>
10100 --- (i)   Q + R= (6250 * 2)= 
<gadget id="calculator">(6250 * 2)</gadget>
<output>12_500</output>
12500 --- (ii)   P + R= (5200 * 2)= 
<gadget id="calculator">(5200 * 2)</gadget>
<output>10_400</output>
10400 --- (iii)   Adding (i), (ii) and (iii), we get:   2(P + Q + R)= 33000 = P + Q + R = 16500 --- (iv)   Subtracting (i) from (iv), we get, P = 6400.   P's monthly income = Rs.6400.   Answer: Rs.6400
<result>E</result>
The average monthly income of P and Q is Rs. 5050. The average monthly income of Q and R is 6250 and the average monthly income of P and R is Rs. 5200. The monthly income of R is?