Answer :
28.1%
Explanation:
Step 1 :
Given that
Cost price for the seller = 290$
Selling price for the seller = 403.1$
Profit = 403.1$ - 290$ = 113.1$
Step 2:
Markup based on Selling price = (Profit/Selling Price)*100
-> (113.1/403.1)*100=28.057%
This can be rounded of to 28.1% (nearest tenth)