charge /tʃɑːrdʒ/
(noun) the amount of money that somebody asks for goods and services
Example: What did they charge for the repairs ?

compile /kəmˈpaɪl/
(verb) to produce a book, list, report, etc. by bringing together different items, articles, songs, etc.; to collect information in order to produce a book, list, etc.
Example: The clerk is responsible for compiling the orders at the end of the day

customer /ˈkʌstəmər/
(noun) a person or an organization that buys goods or services from a shop or business
Example: Let's make sure all invoices sent to customers are kept in alphabetical order

discount /ˈdɪskaʊnt/
(noun) an amount of money that is taken off the usual cost of something
Example: We are offering a 10 percent discount to all new customers

efficient /ɪˈfɪʃnt/
(adjective) doing something in a good, careful and complete way with no waste of time, money or energy
Example: The accountant was so efficient in processing the customer receipts that she had the job done before lunch

estimate /ˈestɪmeɪt/
(verb) to form an idea of the cost, size, value etc. of something, but without calculating it exactly
Example: We estimated our losses this year at about five thousand dollars

impose /ɪmˈpəʊz/
(verb) to introduce a new law, rule, tax, etc.; to order that a rule, punishment, etc. be used
Example: The company will impose a surcharge for any items returned

mistake /mɪˈsteɪk/
(noun) an action or an opinion that is not correct, or that produces a result that you did not want
Example: I made a mistake in adding up your bill and we overcharged you twenty dollars

order /ˈɔːrdər/
(noun) the way in which people or things are placed or arranged in relation to each other
Example: The customer placed an order for ten new chairs

promptly /ˈprɑːmptli/
(adverb) without delay
Example: We always reply promptly to customers' letters

rectify /ˈrektɪfaɪ/
(verb) to put right something that is wrong
Example: Embarrassed at his behavior, he rectified the situation by writing a letter of apology

terms /tɜːrmz/
(noun) the conditions that people offer, demand or accept when they make an agreement, an arrangement or a contract
Example: The terms of payment were clearly listed at the bottom of the invoice