Final answer:
The firm's markup is 20 percent.
Step-by-step explanation:
In order to calculate the firm's markup, we first need to calculate the firm's cost of production. Given that the marginal cost of production is $150.00, the firm's cost of production is constant for each unit produced. The markup is calculated as the profit-maximizing price minus the marginal cost, divided by the profit-maximizing price, and multiplied by 100 to convert it into a percentage.
In this case, the profit-maximizing price is $187.50 and the marginal cost is $150.00. Therefore, the markup is (($187.50 - $150.00) / $187.50) * 100 = 20 percent.