A local shoe store buys shoes at a wholesale price and then marks them up 80% to calculate the retail price. The wholesale price varies, depending on the quantity of shoes purchased. (2 points) Quantity
0-20 pairs
21-40 pairs
41-60 pairs
61-80 pairs
81 or more pairs
Wholesale Price (per pair)
$25.00 each
$23.00 each
$21.00 each
$19.00 each
$17.00 each

Write an equation that could be used to find the retail price for each range. How do you know the equation will work consistently for each range?