Final answer:
To record the transaction on Jones Dairy's books, you would debit the milking machine account and credit the cash account for $40,000.
Step-by-step explanation:
To record the purchase of the milking machine on Jones Dairy's books, you would make the following journal entry:
- Debit: Milking Machine $40,000
- Credit: Cash $40,000
This entry debits the milking machine account, which represents an increase in assets, and credits the cash account, representing a decrease in assets. This transaction is recorded as a cash purchase, as Jones Dairy paid $40,000 in cash for the milking machine.