A man's regular pay is $3 per hour up to 40 hours. Overtime is twice the payment for regular time. If he was paid $198, how many hours overtime did he work?  Choose the correct option:
A) 8 B) 5 C) 9 D) 6 E) 13

Rationale: "at $ 3 per hour up to 40 hours , regular pay = $ 3 x 40 = $ 120 if total pay = $ 168 , overtime pay = $ 198 - $ 120 = $ 78 overtime rate ( twice regular ) = 2 x $ 3 = $ 6 per hour = > number of overtime hours = $ 78 / $ 6 = 13 ans is e"
Answer: E