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A company produces one product and uses process costing. In February, they calculate the following costs per equivalent unit for their two cost categories, materials and conversion costs: Materials cost per equivalent unit: $1.89 Conversion cost per equivalent unit: $0.50 What is the best estimate of the incremental cash cost of producing one unit of this company's product? (Choose the best answer.) Between $1.89 and $2.39 Between $.50 and $2.39 O $1.89 O $.50 O $2.39 Something lower than $.50 O Something higher than $2.39 O Between $.50 and $1.89