Find The Missing Number: Cost $396.00 / Selling Price $440.00 Find The Markup Rate And Markup Amount.?

The markup amount is
markup = (selling price) - (cost)
  = $440 - $396 = $44

The markup rate is usually expressed in terms of the cost.
(markup rate) = markup/cost
  = $44/$396*100% = (1/9)*100% = 11.1%