This is probably not a lot of help. Retail on some types of goods is double wholesale. On tools and such, it tends to be much less I think. Many retailers want 30 to 35%. When I was inventing and manufacturing specialty tools, distribution wanted 30% minimum.
A rule-of-thumb back in the '80's when I was involved; an item manufactured in the USA should retail for five times it's cost to manufacture. That includes raw materials, labor, overhead etc. If a tool or hardgoods type item cost $100 at retail, it cost roughly $20 in direct costs to make (add more for shipping and incidentals like marketing etc), and would wholesale $70 - $80. Those figures would widely depending on type of goods, with retail percentage tending to be lower on higher ticket items. (I was dealing with tools retailing in for $5 to $60 range.)