How much 60% of 50 is greater than 42% of 30?  Choose the correct choice from the following choices
A) 18  B) 91  C) 11  D) 17.4  E) 12

Rationale: "( 60 / 100 ) * 50 – ( 42 / 100 ) * 30 30 - 12.6 = 17.4 answer : d"
Answer: D