Fred earns $6.50 an hour, plus tips, as a waiter. Suppose he works 26 hours in a week. How much money must he receive in tips to earn at least $229 that week?
At $6.50 an hour, Fred will earn $6.50 x 26 = $169.00 in hourly pay.
To earn at least $229.00, subtract: $229.00 - $169.00 = $60.00.
So, Fred must earn at least $60.00 in tips.
+4 
