Answer:
May 1, 2020 - No Entry
Step-by-step explanation:
IFRS 15 requires an entity to recognise revenue when entity transfers the goods or services to the customer.
Transfer of the mower happens on May 31, 2020, this is the date at which Revenue is recognised.
The cash is also paid on May 15, 2020, according the accruals concept, no entry must be done on May 1,2020. Only when the payment occurs should there be a record in Vaughn books.