The Harvey Company has provided the following information about its only product when they sold 10,000 units (all items are per unit).

Revenue $15

Direct labor cost 1.50

Direct Materials 2.00

Manufacturing overhead 6.00 (1/3 variable, 2/3 fixed)

Selling, general and adminstrative 1.00 (1/2 is variable, 1/2 is fixed)

Profit before tax $4.50

For every additional unit sold above 10,000, the company's profit before taxes will increase by: