Answer:
c. 6
Step-by-step explanation:
Given
See attachment for graph
Required
Average rate of change
This is calculated as:

Where

So, we have:


Using the attached graph, we have:


So, we have:



Answer:the tip itself will be $6.20 but in total it will all cost $68.20
Step-by-step explanation:
The markup is $46.25 and the final price is $231.25