Answer:
1,200 laborers are employed at the plant.
Explanation:
Labor productivity is given as total output divided by total input
The total output is 60,000 hot water heaters
Let the number of laborers employed be y.
Since each laborer would work 200 hours per month, total input = y×200 = 200y hours
0.25 = 60,000/200y
y = 60,000/0.25×200 = 60,000/50 = 1,200 laborers