CAT Exam Numerical Ability Averages

The average runs scored by a batsman who has played 52 innings was increased by 126.find the average runs of the batsman before this innings.
(A) 47 years
(B) 44 years
(C) 42 years

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CAT Other Question

interer of a polygon smallest angle is 120 degree and common dif is 5 degreen find no of sids a dishonest dealer markup the price of his goods by 20% and gives a discount of 10% to the customer .besides he also cheats both his supplier and his buyer bu 100 grams while buying or selling 1 kilogram .find the percentage profit earned by the shopkeeper?