Iguana Company sells a single product. Iguana estimates demand and costs at various activity levels as follows: Units Sold Price Total Variable Costs Fixed Costs 120,000 $48 $1,000,000 $3,000,000 $3,500,000 140,000 $45 $1,000,000 160,000 $40 $4,000,000 $1,000,000 180,000 $35 $4,500,000 $1,000,000 200,000 $30 $5,000,000 $1,000,000 How would you best describe Iguana's variable cost per unit over the range shown? It is constant It is increasing as volume increases O It is decreasing as volume increases It is first increasing as volume increases, then decreasing