Exoletica, Inc. is a retail store that had sales of $1,250,000 in July and $1,500,000 in August. The store has 25 full-time employees and each employee works 8 hours per day. In the month of July, the store also had 15 part-time employees and each part-time employee worked 4 hours per day. In the month of August, the store also had 18 part-time employees and each part-time employee worked 4 hours per day. Assume that there are 20 work days in each month.

a. What is the labor productivity (expressed in sales dollars earned per labor-hour) for the month of July?

b. What is the labor productivity (expressed in sales dollars earned per labor-hour) for the month of August?

c. What is the percentage change in labor productivity from July to August? Did the labor productivity increase, decrease, or remain the same?