Let us try to formulate equation for Hats off:
Design fee charged by hats off = $50
Charge of one hat = $5
Let us say "x" hats are sold by Hats off.
So charge of x hats will be = 50 + 5x.
Let us try to formulate equation for Top Stuff:
Design fee charged by top stuff = $25
Charge of one hat = $6
Let us say "y" hats are sold by Top stuff.
So charge of y hats will be = 25 + 6y.
Answer:
Pricing by hats off = 50 +5x
Pricing by top stuff = 25 +6y