A company has determined that the price and the monthly demand of one of its products are related by the equation D = √(400 − p), where p is the price per unit in dollars and D is the monthly demand. The associated fixed costs are $1,125/month, and the variable costs are $100/unit. Use this information to answer Problems 2-52 and 2-53. Select the closest answer.

Which of the following values of D represents the breakeven point?

(a) 10 units 

(b) 15 units 

(c) 20 units

(d) 25 units