Final answer:
To calculate the incremental income if the company decides to rework the units, compare the costs and revenues of both options. The incremental income if the company decides to rework the units is $198,100.
Step-by-step explanation:
To calculate the incremental income if the company decides to rework the units, we need to compare the costs and revenues of both options.
Option 1: Selling as scrap - The company can sell the 44,000 defective units as scrap for $176,400.
Option 2: Reworking and selling - The reworking cost for the units is $223,500 and the units can be sold for $421,600.
The incremental income is calculated by subtracting the total cost of reworking from the total revenue generated by selling the reworked units:
Incremental income = Revenue from reworked units - Cost of reworking
Incremental income = $421,600 - $223,500 = $198,100
Therefore, the incremental income if the company decides to rework the units is $198,100.