David Austin recently purchased a chain of dry cleaners in northern Wisconsin. Although the business is making a modest profit now, David suspects that if he invests in a new press, he could recognize a substantial increase in profits. The new press costs $15,400 to purchase and install and can press 40 shirts an hour (or 320 per day). David estimates that with the new press, it will cost $0.25 to launder and press each shirt. Customers are charged $1.10 per shirt.
a. How many shirts will David have to press to break even?