Casey has a job doing valet parking. Casey makes an hourly rate of $4.55 per hour plus tips. Last week Casey worked 26 hours and made $898.55. How much in tips did Casey earn last week?

Casey’s hourly wages were 26 × $4.55 = $118.30. Subtract those wages from the total earnings: $898.55 − $118.30 = $780.25, so Casey earned $780.25 in tips.

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