The list price of an article is Rs.66. A customer pays Rs.56.16 for it. He was given two successive discounts, one of them being 10%. The other discount is?
Choose one.
A) 3.45 %  B) 4.45 %  C) 5.45 %  D) 6.45 %  E) 7.45 %

Rationale: "66 * ( 90 / 100 ) * ( ( 100 - x ) / 100 ) = 56.16 x = 5.45 % answer : c"
Answer: C