Edward C. answered 02/19/15
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Caltech Grad for math tutoring: Algebra through Calculus
Total cost = Food + Tax + tip
Food = $40
Tax = 4% of $40 = 0.04 * ($40) = $1.60
Tip = 16% of $40 = 0.16 * ($40) = $6.40
So total cost = $40 + $1.60 + $6.40 = $48.00