in accounting whats is the difference betwee mark up on sales and mark up on cost?

Answer 1

On sales would be more, but I don't see how you could do it.
Say you buy something for 100 and mark it up 25% you would sell it for 125 if you marked it up from sales you would be marking up a larger number but how would you compute the sales amount without marking it up from cost?

Answer 2

They measure the same thing except the the equations tell you different things.

% of Cost is the same as Gross Profit Margin
(revenue - cost) / revenue

% of Sales is ROI
(revenue - cost) / cost

Example:
Cost: $900.00
Revenue: $1,200.00
Net Rev: $300 (revenue - cost)

% of Sales (% Margin)> > 25%
% Cost (ROI)> > > > > > 33%