At current sales volume, variable costs are $6 per unit, fixed costs are $8 per unit, and unit costs (total costs per unit) are $6+$8-$14 per unit. Price is $10 per unit. If we sell 100 more units (which is in the relevant range), profit will increase by $400 increase by $1,000+ O increase by $200 not enough information -- need to know the original sales volume decrease by $400 Estimate unit variable cost. (hint: should you use lowest/highest activity or lowest/highest cost?) Sales volume in Month Total costs units April $151 25 May $135 15 June $155 19 O $4/unit O $20/unit O $10/unit O not enough information O $1.60/unit