ˈmark-up  British English, 
mark‧up American English /ˈmɑːkʌp $ ˈmɑːrk-/
 noun [countable] an increase in the price of something, especially from the price a shop pays for something to the price it sells it for ⇒ 
mark up: 
 The retailer’s mark-up is 50%.
 The retailer’s mark-up is 50%.  [TahlilGaran] Dictionary of Contemporary English ▲