Correct Answer - Option 3 : 41

**Given:**

Runs scored by batsman in 12^{th} innings = 85 runs

Batting average increases by 4

**Formula used:**

Total runs scored = Average × Number of innings

**Calculation:**

Let average runs after 11^{th} innings be n

Batting average after 12^{th} innings = (n + 4)

Total run in 11 innings = 11n

According to the question

⇒ (11n + 85) = 12(n + 4)

⇒ 11n + 85 = 12n + 48

⇒ n = 37

Average after 12^{th} innings = (n + 4)

⇒ 37 + 4 = 41

**∴ The batting average after 12**^{th} innings is 41