11-04-2018
Mathematics

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18-04-2018

A. $14.40 tip
[tex] \frac{18}{100} = \frac{x}{80} [/tex]
18 × 80= 1440
1440 ÷ 100= 14.4

B. $6 sales tax
[tex] \frac{7.5}{100} = \frac{x}{80} [/tex]
7.5 × 80 = 600
600 ÷ 100 = 6

C. $100.40 total
80 + 6 = 86
86 + 14.4 = 100.4

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