Answer:
y=50x+100
Step-by-step explanation:
The total cost, y is given by
y=100+50x where x is the number of days
When graphing, using y=mx+c, the gradient will be always 50 and at point when x=0, y=100 when x=1, y=150, when x=2, y=200 when x=3, y=250 and when x=4, y=300
