Final answer:
In Lakeside's statement of cost of goods manufactured for August, raw materials used will be reported as $279,000.
Step-by-step explanation:
In Lakeside's statement of cost of goods manufactured for August, raw materials used will be reported as the difference between the raw materials available at the beginning of the month and the raw materials available at the end of the month, plus the raw materials purchased during the month.
Raw materials used = (Raw materials, August 1 - Raw materials, August 31) + Raw materials purchased
Raw materials used = ($65,000 - $72,000) + $286,000
Raw materials used = $279,000
Therefore, the correct answer is a) $279,000.