Final answer:
The accrued interest payable at December 31, 2015, is $24,000.
Step-by-step explanation:
To calculate the accrued interest payable at December 31, 2015, we need to determine the amount of time that has passed since September 1, 2015. From September 1 to December 31, there are 4 months. The interest rate on the note payable is 9%. Thus, we can calculate the accrued interest as follows:
Accrued Interest = Principal amount × Interest rate × Time
Accrued Interest = $900,000 × 9% × (4/12) = $24,000