Final answer:
The question involves calculating the supplies used from the original amount of $600, resulting in $350 used when $250 remain. This is important for determining expenses for an accounting profit calculation.
Step-by-step explanation:
The question is asking to analyze the usage of supplies over a specific period. Initially, there were $600 worth of supplies, and by September 30th, only $250 worth of supplies remain on hand. The usage of supplies can be calculated by subtracting the remaining supplies from the original amount. So, the supplies used would be calculated as $600 - $250 = $350. This means that over the time period, $350 worth of supplies were used. This type of analysis is critical in accounting as it helps determine the expense for the period, which aids in calculating profitability, such as accounting profit.