The average of 10 numbers was calculated as 18. It is discovered later on that while calculating the average, one number, namely 66, was incorrectly read as 26. What is the correct average?
Choose the correct choice
A) 20 B) 21 C) 22 D) 23 E) 24

Rationale: "10 * 18 - 26 + 66 = 220 220 / 10 = 22 the answer is c ."
Answer: C