Bill makes $20 an hour for the first 40 hours, meaning he gets paid 40*20= <<40*20=800>>800 dollars.
For the remaining 10 hours, Bill gets paid double the amount of $20, meaning he makes 20*2=40 dollars an hour.
Since he worked 10 hours at that $40 an hour rate, that means he gets paid 10*40= <<10*40=400>>400 dollars for the final 10 hours.
In total, this means Bill gets paid 800+400=<<800+400=1200>>1200 dollars for his workweek.
#### 1200