Walsh automobile company fabricates automobiles. each vehicle includes one airflow sensor, which is currently made inminushouse. details of the airflow sensor fabrication are as follows: volume 700 units per month variable cost per unit $ 7 per unit fixed costs $ 13 comma 000 per month a japanese factory has offered to supply walsh with readyminusmade units for a cost of $ 16 per sensor. assume that walsh's fixed costs could be reduced by $ 4 comma 000 if it outsources and that walsh will not be able to use the excess capacity in any profitable manner. if walsh decides to outsource, monthly operating income will