The profit the store makes on each foot of rope is $0.12
Rate of change of function
The rate of change of function is its slope, According to the function given expressed as;
y = 0.12x
Standard equation of a line
The standard equation of a line is expressed as y = mx +b
- m is the slope or rate of change
- b is the y-intercept
Compared with the given equation:
mx = 0.12x
m = 0.12
This shows that the profit the store makes on each foot of rope is $0.12
Learn more on rate of change here; https://brainly.com/question/8728504