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Answer:
Increase by $31,500
Explanation:
Calculation to determine the operating income
First step is to calculate the Total relevant cost
DIFFERENTIAL ANALYSIS
MAKE BUY
Variable cost $144,900 $0
(2,100*$69)
Fixed cost $46,200 $0
(2,100*55*40%)
Purchase cost $0 (2100*76) = $159,600
Total relevant cost $191,100 $159,600
Now let determine the Increase or decrease of the company's operating income
Increase by =($191,100- $159,600)
Increase by = $31,500
Therefore Buying the valves from the outside supplier instead of making them would cause the company's operating income to: Increase by $31,500