The Commerce Students Society orders cloth patches embossed with the business schools crest. The patches have Velcro to attach them over the pocket of a jacket. The patches come in a box containing 75 units. The manufacturer has stipulated that patches must be ordered in boxes. The cost of each patch to the society is $2.21. The society intends to sell each patch for $5.37. Student volunteers selling the patches are to be paid a commission of $0.47 for each patch sold. The school admits 325 students each year. The society hopes to sell each student a patch and consequently has placed an order for the minimum number of boxes required to sell at least 325 patches. How many patches must be sold for the society to break even?