This morning, Roy processed two catering orders at the sandwich shop where he works. The first order was for 10 trays of club sandwiches and 10 trays of vegetarian sandwiches, at a cost of $180. The second order, which cost $136, was for 8 trays of club sandwiches and 7 trays of vegetarian sandwiches. How much do the trays cost? A tray of club sandwiches costs $, and a tray of vegetarian sandwiches costs $.