He'll be getting a hefty refund at tax time.
I ran the numbers through
https://www.dinkytown.net/java/PayrollHourly.html
The information presented tells me he make $10 an hour. A weekly paycheck would gross $400, but net $324.81 minus state and local taxes. 12 hours OT would give him a gross of $580, with a net of $464.04 less state and local taxes.
The extra $180 he earned in OT would be $139.23, a vast difference from the $40 stated.
But then, this is Bad Luck Brian, after all.