Pharmco incurred the following costs while manufacturing its product: Materials used in production, $120,000; factory depreciation, $60,000; property taxes on the administrative offices, $12,000; labor costs of assembly-line workers, $95,000; factory supplies used, $8,000; advertising expense, $13,000; property taxes on the factory, $20,000; delivery expense, $23,000; salaries of the sales staff, $53,000; and sales commissions, $17,000. Total product costs for Pharmco are

a.$303,000.

b.$315,000.

c.$391,000.

d. $421,000.