Monroe Manufacturing, Inc. reported the following information related to inventory, which sells for $$20$ per unit:

Beginning inventory: $3,000$ units at $$3$ unit cost

Purchase $1$: $4,000$ units at $$4$ unit cost

Purchase $2$: $5,000$ units at $$5$ unit cost

At the end of the period, the company has $4,000$ units in ending inventory. Compute the cost of goods sold and ending inventory using the following methods: Weighted Average, FIFO, and LIFO methods.