Answer:
Option A. 17600
Explanation:
Cost Of Goods Sold: Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â $
Opening Inventory at the start of the month ( 1st Jan 2017) Â Â Â Â Â 4000
Add:Purchases                                             17800
Less:Closing Inventory at the end of the month ( 31st Jan 2017) Â Â (4200)
Cost of goods sold for the month                             17600
                                          Â