Mary visits the local coffee shop to use the WiFi for school projects. Mary has an English book review to write, a social studies paper, and a science presentation to complete. She first arrives and orders a coffee at $2.15 and tips 5% at the counter. Two hours later, she finishes her English review and waitress stops by. Mary decides to order a latte at $4.50, but doesn't tip. Over the next hour, the waitress returns and Mary orders another coffee and leaves a 15% tip for both the latte and coffee. An hour later, Mary completes all of her projects and leaves. What is the total tip Mary left at the coffee shop?