Answer: C) 
Step-by-step explanation:
Given: The rate of amount Sam earns each hour =$6
The number of hours he works on a particular day =4
Then , the amount earned by Sam excluding tips =
Amount he earned as tip by each person he serves =$2.50
If n represents the number of people Sam serves that day, then the amount he earns from tip in a day = 2.5n
Now, the function used by Sam to figure E, his total earnings for the day is given by :-
