Travis and Paula went to lunch. Travis ordered a sandwich for $7.50, and ordered a burger for $5.25. After lunch, they left a 15% tip for their waiter. How much money did they spend altogether? Explain.

Travis and Paula went to lunch. Travis ordered a sandwich for 7.50, and ordered a burger for 5.25. After lunch, they left a 15 tip for their waiter. How much mo class=