We are given equation of total campsite charge

where
C is total campsite charge C (in dollars)
d is the number of days that the site is rented
so, here we will have
C is y-axis or dependent variable
d is x-axis or independent variable
we can find any two points and then we locate it
after that we can join them to get our graph
At d=0:


so, our point is (0,8)
At C=0:



so, our point is 
now, we can locate these points and then join it
Answer:
93%
Step-by-step explanation:
28 divided by 30= 0.93
0.93= 93%