The difference between the retail and wholesale unit price is $ 0.99.
What is retail price?
The retail price is the price that the item is sold for to the customer.
Here,
Coordinates extracted from the graph;
(4, 1) (12, 3)
Equation of straight line (Whole sale price)
(y - y₁) = m(x - x₁)
where, m = (y₂-y₁)/(x₂-x₁)
then, m = (3-1) / (12-4)
= 2/8
= 1/4
Now, (y - 1) = 1/4 (x - 4)
4y - 4 = x - 4
x = 4y
x - 4y = 0
Now, whole sale price for 24 boxes; x = 24
24 - 4y = 0
4y = 24
y = 24/4
y = 6
The wholesale price = $ 6
The retail price = $ 6.99
The difference between retail and wholesale = Retail - Wholesale
= 6.99 - 6
= $ 0.99
Thus, the difference between the retail and wholesale unit price is $ 0.99.
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