Answer and Explanation:
The journal entries are shown below:
a. Account payable Dr $108,000
     To note payable $108,000
(Being the issuance of the note is recorded)
b. Note payable Dr $108,000
 Interest expense Dr $540  ($108,000 × 30 days ÷ 360 days × 6%)
        To cash $108,540
(being the note payable and the interest expense is recorded)