Final answer:
A cash transaction, where a company sells a machine for $15,000 in cash.
Step-by-step explanation:
The type of transaction where a company sells a machine for $15,000 in cash is a Cash transaction.
A cash transaction involves the exchange of goods or services for immediate payment in cash.
In this case, the company received $15,000 in cash at the time of sale, making it a cash transaction.