Mable's Engine Company manufactures part Z92 used in several of its engine models. Monthly production costs for1,000 units are asfollows:

Direct Materials: $30,000

Direct Labour: $8,000

Variable Overhead Costs: $21,000

Fixed Overhead Costs: $5,000

Total Cost: $64,000

Mable's Engine Company has the option of purchasing the part from an outside supplier at$61 per unit. It is estimated that all of the fixed overhead costs assigned to Z92 will remain if the company purchases Z92 from an outside supplier.

IfMables's Engine Company purchases1,000 Z92 parts from the outside supplier permonth, then its monthly operating income will.