Longman Dictionary of Contemporary English
mark-up
noun
EXAMPLES FROM CORPUS
▪ Context-tables use the same troff -like mark-up as the rest of a document.
▪ Given the mark-up on room service, he quite likes it.
▪ If there were to be a reduction in the mark-up, then this would further reinforce the effect.
▪ The mark-up should be fair and reasonable, the speculator being reimbursed for both time and enterprise.
▪ The client must be told the hourly rate charged and the extent of the mark-up for skill, care and attention.
▪ The existence of a mark-up has to be taken into account when considering the response to a corporate tax.
▪ They're probably cheaper than Selina, come to think of it, what with the hotel mark-up.
Wiktionary
mark-up
n. (alternative spelling of markup English)