The final cost of Dreamworld's warehouse is $1554000 
Step-by-step explanation:
 Expenditure Time period Average expenditure 
January 1,2021 300000 12/12 300000 
September 1,2021 450000 4/12 150000 
December 31,2021 450000 0/12 0 
Total 1200000 450000 
Interest capitalized for 2021 54000 = 450000 into 12% 
Total expenditure till Jan 1, 2022 1254000 = 1200000 + 54000 
 Expenditure Time period Average expenditure 
Total expenditure
 till Jan 1,2022 1254000 9/9 1254000 
March 31,2022 450000 6/9 300000 
September 30,2022 300000 0/9 0 
Total 1554000 
Therefore, the Option B $1,554,000 is correct final cost of Dreamworld's warehouse.