I believe the answer is sometimes
In 1 hour, a machine could make:

parts
In 28.8 hours, that machine make

parts
20× 8 = 160
160 + 2x > or = 500
-160--------------- -160
2x > or = 340
÷2------------÷2
x > or = 170
She has to sell at least 170 cupcakes to make $500 in profit.
Hope this helps!
Answer:
Most of the question is missing. If you could type out the rest, we might be able to help you.