Stryker Industries received an offer from an exporter for 30,000 units of product at $16 per unit. The acceptance of the offer will not affect normal production or domestic sales prices. The following data are available: Domestic unit sales price Unit manufacturing costs: $21 Variable Fixed 12 6 The differential cost from the acceptance of the offer is a. $180,000 Ob. 1630,000 Oc. $360,000 Od. $480,000