Explaination
The waiter earns by adding his wage for 6 hours and his tip.
wage earned for 6 hours = 6 \u00D7 $11.00 = $66.00
tip earned from orders = 10% \u00D7 $425.00 = 0.10 \u00D7 $425.00 = $42.50
total earnings of the waiter = $66.00 + $42.50 = $108.50