LMN started Business on 1 dec 2019. during dec, it made 3 purchases: 1. on 4 dec, purchased 80 units at $7 each 2. on 16 dec, purchased 160 units at 6$ each 3. on 20 dec, purchased 390 units for $8 each. During the month, 360 units sold for $13 each. Which is the closing inventory at the end of Dec 2019 using weighted average