Minor Electric has received a special one-time order for 600 light fixtures (units) at $12.00 per unit. Minor currently produces and sells 3000 units at $13.00 each. This level represents 75% of its capacity. Production costs for these units are $15.00 per unit, which includes $10.00 variable cost and $5.00 fixed cost. To produce the special order, a new machine needs to be purchased at a cost of $650 with a zero salvage value. Management expects no other changes in costs as a result of the additional production. If Minor wishes to earn $1150 on the special order, the size of the order would need to be: 3600 units. 1800 units. 900 units. 50 units. 840 units