Answer:
$75
Explanation:
Given,
Initial fee / charge = $50
Charge per 3 days of work = $225
The rate of change is the slope which is the change in amount charged per day;
HENCE, we need to calculate the charge per day on other to find the rate of change :
If $225 is charged for 3 days
Amount charged per day is ;
$225 / 3
= $75 is charged per everyday of work it takes to complete the project