Step-by-step explanation:
The computation and the journal entries are as follows
On May 15
1. Supplies A/c Dr $3,300
To Cash A/c $3,300
(Being the supplies purchased for cash)
On May 31
2. Supplies expense A/c Dr $3,500
To Supplies A/c $3,500
(Being supplies account is adjusted)
The supplies expense is computed below
= Supplies balance + purchase of supplies - supplies on hand
= $500 + $3,300 - $300
= $3,500
3. Now the adjusting balance is
For supplies = ending balance = $300
And, the supplies expense is $3,500