Yerke Company makes jungle gyms and tree houses for children. For jungle gyms, the price is $120 and variable expenses are $90 per unit. For tree houses, the price is $200 and variable expenses are $100. Total fixed expenses are $253,750. Last year, Yerke sold 12,000 gyms and 4,000 tree houses. Now suppose that Yerke expects tree house demand to increase from 4,000 to 8,000 units. What is the number of tree houses sold at break-even? a. 1,750 b. 2,625 c. 1,002 d. 875 e. 668