A batsman in his 12th inning makes a score of 60 and their by increasing his average by 4. What is his average after the 12th inning? Choose the correct choice from the following choices:
A) 12	B) 16	C) 20	D) 24	E) 28

Rationale: "11 x + 60 = 12 ( x + 4 ) x = 12 + 4 = 16 answer : b"
Answer: B