The Time Consuming Tip

Team: 
The Lunch Bunch
Topic: Algebraic Expressions & Equations
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In a strange twist of fate, two customers who had ordered identical means came up with the exact same tip but had used different methods to find it. Two waitresses must harness the power of math to figure out how this came to be.

Common Core Standards: 8.EE.7
Problem #: 
134 (2015-2016)
Problem Difficulty Level: 5 [?]