Using the given proportional relationship, it is found that the meaning of the x-intercept in the equation is given by:
d) amount of sales when no money has been earned
A proportional relationship is a function in which the output variable is given by the input variable multiplied by a constant of proportionality, that is:
y = kx
In which k is the constant of proportionality.
In this problem, the relationship is:
y = 0.25x.
In which y is the amount of money earned on x sales.
The x-intercept is the value of x when y = 0, that is, the value of x when no money has been earned, hence option d is correct.
More can be learned about proportional relationships at https://brainly.com/question/10424180