If the revenue for the week is $2000, and labor cost consists of two workers earning $8 per hour who work 40 hours each, what is labor cost as a percentage of revenue?

2 workers 8 dollars per hour and 40 hours
mutiply
2*8*40=640 dollars

now costlabor/revenue (try to get to percent which is parts out of 100 so x%=x/100)
640/2000
64/200
32/100=32%

answer is 32%