Infosys Company Numerical Ability Averages

The average monthly income of P and Q is Dollar 5050. The average monthly income of Q and R is Dollar 6250 and the average monthly income of P and R is Dollar 5200. The monthly income of P is:
a)Dollar 3500
b)Dollar 4000
c)Dollar 4050
d)Dollar 5000

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Infosys Other Question
A grocer has a sales of Euro 6435, Euro 6927, Euro 6855, Euro 7230 and Euro 6562 for 5 consecutive months. How much sale must he have in the sixth month so that he gets an average sale of Euro 6500?
a)Euro 4991
b)Euro 5991
c)Euro 6001
d)Euro 6991 A car owner buys petrol at Euro 7.50, Euro 8 and Euro 8.50 per litre for three successive years. What approximately is the average cost per litre of petrol if he spends Euro 4000 each year?
a)Euro 7.98
b)Euro 8
c)Euro 8.50
d)Euro 9