Answer:
The number of laborers employed by the plant is 120 laborers
Step-by-step explanation:
According to given data Annual output = 57600 water heaters.
So the output per month = 57,600 / 12 months = 4,800 water heaters
Each labor works 160 hours per month
Suppose ,there are x number of laborers employed by the plant. So,x number of laborer will work 160x hours per month. So the labor input = 160x per month
Labor productivity = 0.25
Labor productivity = Output / Labor input
0.25 = 4800 / 160x
25/100 = 4800/160x
160x = (4800 X 100) / 25
160x = 19200
x = 19200/160
x = 120
Therefore, the number of laborers employed by the plant is 120 laborers