Final answer:
The beginning inventory (BI) of Ace electronics must have been $9,000.
Step-by-step explanation:
To find the beginning inventory (BI), we can use the formula:
BI = Purchases + Ending Inventory - Cost of Goods Sold (COGS)
Given that COGS is $20,000, purchases are $23,000, and ending inventory (EI) is $6,000, we can rearrange the formula to solve for BI:
BI = Purchases + EI - COGS
Substituting the values:
BI = $23,000 + $6,000 - $20,000
BI = $9,000
Therefore, the beginning inventory is $9,000.