Question

Marcos works 8 hours a day. He makes $19 an hour. On Tuesday, he only worked 3/4 of a day. How much did Marcos earn on Tuesday?

Which answer gives the correct solution and explains how to check if the answer is reasonable?
A.
Solution: $57.
Explanation: Since Marcos only worked 3/4 of the day,

he made about 3 × $20 or about $60.

B.
Solution: $456.
Explanation: Since Marcos only worked 3/4 of the day,

he earned about 3 × $20 or about $60.

Since there are 8 hours in the work day,

then Marcos made about 8 × $60 or about $480.

C.
Solution: $114.
Explanation: If Marcos worked all day,

then he would have made about 8 × $20 or about $160.

Since Marcos only worked 3/4 of the day, or 0.75,

he would make about $120 (160 × 0.75).