Answer:
8.33 hours or 8 hour 20 minutes
Explanation:
A small metal shop operates 10 hours each day, producing 100 parts/hour.
If productivity were increased 20%, then the production will be 120 parts/hour
Then the number hours the plant have to work to produce 1000 parts will be 1000 units / 120 parts per hour = 8.33 hours or 8 hour 20 minutes