The employees of a hardware store ordered lunch from a local delicatessen. The lunch consisted of 4 turkey sandwiches and 7 orders of french fries, for a total cost of $16.70. The next day, the employees ordered 5 turkey sandwiches and 5 orders of french fries totaling $16.75. What does the delicatessen charge for a turkey sandwich? What is the charge for an order of french fries?