suppose that a firm produces 200,000 units a year and sells them all for $10 each. the explicit costs of production are $1,500,000 and the implicit costs of production are $300,000. the firm earns an accounting profit of and an economic profit of . a) $500,000; $200,000 b) $500,000; $1,700,000 c) $1,700,000; $200,000 d) $1,700,000; $500,000