Complete the history portion of the Elm Co. SOP spreadsheet Inventory is valued at $700 per unit. The actual inventory at the end of September was 150 units A B D E F 1 2 3 4 5 Sales 6 Plan (in units) 7 Actual (in units) Difference month 9 Difference cumulative 10 11 Operations 12 Plan (in units) 13 (in employees) 14 Number working days/mo. 15 Actual (in units) 16 Diff. month 17 diff. cumulative 18 19 Inventory 20 Plan (in units) 21 (in 1,000 $) 22 Actual (in units) 23 Days of supply History November Future January October December 800 826 26 26 850 851 1 27 900 949 49 900 800 6 23 798 800 8 19 802 800 8 19 800 19 122 73 -76