Теория:

To speak about sales, you need the appropriate vocabulary.
 
Sales-chart.shutterstock_266132192-930x697.jpg

After-sales service - service provided after a customer has paid for and received a product or service;

Buyer - someone who buys something;

Sales - the number of items sold;

Close a deal - to make a successful business arrangement with someone;

Cold call - the activity of calling or visiting a possible customer to try to sell them something without being asked by the customer to do so;

Customer - a person or organization that buys goods or services from a shop or business;

Deal - an arrangement or an agreement, especially in business;

Discount - a reduction in price;

Warranty - a written promise made by a company to change or repair one of its products if it has a fault;

In bulk - in large amounts;

Lead - to show someone where to go, usually by taking them to a place or by going in front of them;

Objection - when someone says that they do not like or approve of something or someone;

Prospect - the idea of something that will happen in the future;

Sales representative - someone who travels to different places trying to persuade people to buy their company's products or services;

Retail - when products are sold to customers from shops;

Wholesale - relating to products which are sold in large amounts, usually at a cheaper price.

Examples:

We closed a deal with a major supermarket.

Mrs Wilson is one of our regular customers.

This shop has wholesale prices.
Источники:
venturebeat.com