Matt took clothes to the cleaners three times last month. First, he brought 4 shirts and 1 pair of slacks and paid $12.45. Then he brought 5 shirts, 2 pairs of slacks, and 1 sports coat and paid $25.92. Finally, he brought 4 shirts and 2 sports coats and paid $21.94. How much was he charged for each shirt, each pair of slacks, and each sports coat?