Using LIFO, the last 100 units sold are at $15 each and the next 50 units are at $10 each, resulting in a cost of goods sold of (100 * $15) + (50 * $10) = $1,750.

Under FIFO, the first 75 units sold would be from the first purchase, totaling $1,000 (100 units at $10) + $125 (25 units at $15).

Under FIFO, older, cheaper costs are used for cost of goods sold, leading to a lower cost of goods sold when prices are rising.

In a declining price environment, FIFO will result in a higher ending inventory value as it uses older, higher costs.

Using LIFO during rising prices results in a lower inventory value on the balance sheet because older, cheaper costs are recorded.

The primary disadvantages of LIFO include lower net income, higher taxes, and complexity in record-keeping.

FIFO would result in higher taxes during inflation because it reports higher profits due to lower cost of goods sold.

LIFO provides a better matching of current costs with current revenues during inflation as it matches the most recent costs against revenues.

The Weighted Average method provides a more accurate matching of costs with revenues during price fluctuations by averaging the costs of all inventory.