In January, 5,000 units were manufactured at a unit cost of $5. At this level of activity, variable costs are 40 percent of total unit costs. The following month, the company planned to manufacture 4,500 units. If cost behavior patterns remain unchanged in February,

1. total fixed costs will decrease
2. None of them
3. total variable cost will change
4. total cost per unit will decrease
5. variable cost per unit will decrease