The proportional equation that can be used to find the amount of markup y on the cost of a ring x is given by:
[tex]y = 3.4x[/tex]
What is a proportional relationship?
- 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:
[tex]y = kx[/tex]
- In which k is the constant of proportionality.
In this problem, the markup rate is of 340%, hence [tex]k = \frac{340}{100} = 3.4[/tex].
Then, the equation is:
[tex]y = 3.4x[/tex]
You can learn more about proportional equations at https://brainly.com/question/25067191
