Question

While working at a yard sale, Ying helps a customer who buys items that cost $5, $2, $2.50, and $0.25. The customer hands Ying $3 and says to keep the $0.18 change. How much did the customer think the total was?
$3.00 - $0.18 = $____
I don't really think I'm right but it would be $5+$2+$2.50+$0.25 maybe?
My teacher told me I have to show my work. Can you help me show my work for part b and part a?

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