The answer depends on what precisely the question is.
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You need to earn an additional 56 (140 - 84) dollars. Since you earn 7 dollars per hour, you will need to work for 8 hours (56 / 7) to reach your goal.
(8 hours / day) x (7 days) = 56 hours ($6 / hour) x (56 hours) = $336
You work for 312.5 hours.
$66
If he works 10 hours per day for five days, then each day he will earn $250 for the first 8 hours plus $40/hour for the additional two hours, for a total of $330/day or $1,650/week.