Parsons Plumbing & Heating manufactures thermostats that it uses in several of its products. Management is considering whether to continue manufacturing the thermostats or to buy them from an outside source. The following information is available.

1.The company needs 80,000 thermostats per year. Thermostats can be purchased from an outside supplier at a cost of $6 per unit.

2.The cost of manufacturing thermostats is $7.50 per unit, computed as follows.

Direct materials$156,000

Direct labor132,000

Manufacturing OH:

Variable $168,000

Fixed144,000

Total cost$600,000

Cost per unit ($600,000/80,000)$7.50

3.Discontinuing the manufacture of the thermostats will eliminate all of the direct materials and direct labor costs but will eliminate only 60 percent of the variable overhead costs.

4.If the thermostats are purchased from an outside source, certain machinery used in the production process would no longer have to be leased. Accordingly, $9,200 of fixed overhead costs could be avoided. No other reductions will result from discontinuing production of the thermostats.

Required:

a-1.what is schedule to determine the incremental cost or benefit of buying thermostats from the outside supplier.

b-1.what is the schedule showing the incremental cost or benefit of buying thermostats from the outside source and using the factory space to produce additional heat-flow regulators.

Effect of alternative space:

Schedule:

Incremental benefit/cost of buying thermostats from outside source

Add: contribution margin of alternative use of factory space

Equals: incremental cost/benefit of buying from outside source