Answer: 15
Step-step-explanation:
Answer:

Step-by-step explanation:
Let's write this out as an equation. Let the unknown quantity be x:

8*40 = 320 * 2 = $640 for the 2 workers
640/2000 = 0.32
labor cost is 32% of the revenue
-14+3/2b-(1+2/8b), then take out the blanket become -14+3/2b-1-2/8b , get 5/4b-15=0 so 5/4b=15 ,get b=15×4÷5. b=12