Answer:
1) (a) (i) $360
1) (a) (ii) $480
2) 4 hours
3) Not sure what a gradient of the line is, but I think it is asking for the slope, which is explained below.
Step-by-step explanation:
Find the slope: I used the points (5, 400) and (2, 160). So, 400-160/5-2 = 240/3 = 80
So for every hour, this person makes 80 dollars/hour
