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.) \begin{tabular}{l} Between $1.89 and $2.39 \\ \hline Between $.50 and $2.39 \\ $1.89 \\ $.50 \\ $2.39 \\ \hline \end{tabular} Something lower than $.50 Something higher than $2.39 Between $.50 and $1.89