If the remainder is 11 when the integer n is divided by 20, what is the remainder when 2n is divided by 10?  Choices.
A) 0  B) 1  C) 2  D) 3  E) 4

Rationale: "n = 20 k + 11 2 n = 2 ( 20 k + 11 ) = 4 k * 10 + 22 = 4 k * 10 + 2 * 10 + 2 = 10 j + 2 the answer is c ."
Answer: C