​Vocabulary

• tip:  a sum of money customarily given by a client or customer to workers for the service they have performed, in addition to the basic price of the service.

• commission: A fee paid for services, usually a percentage of the total cost; a fee paid to an employee for transacting a piece of business or performing a service.

• sales tax: a tax paid to a governing body for the sales of certain goods and services.​

• simple interest: is interest calculated on the original price of a loan or the original contribution to a savings account.​