Final answer:
The correct action to take with a receipt from a petty cash purchase is to attach it to the voucher. This ensures accurate tracking and accounting of petty cash expenses.
Step-by-step explanation:
When handling petty cash transactions, it is important to keep a detailed record for accounting purposes. Upon returning with a receipt for a purchase made using petty cash, you should attach the receipt to the voucher. This serves as proof of the expense and ensures that all financial transactions are transparent and accounted for properly. The receipt is an essential document for bookkeeping and potential audits, therefore it must not be discarded, kept loose for reference, or filed separately without being attached to the voucher it corresponds to.