Bentley Enterprises Uses Process Costing to Control Costs in the Manufacture

Bentley Enterprises uses process costing to control costs in the manufacture of Dust Sensors for the mining industry. The following information pertains to operations for November. (CMA Exam adapted)
$$\begin{array} { l c } & \text { Units } \\\text { Work in process, Novernber } 1 ^\text { st } & 16,000 \\\text { Started in production during Novernber } & 100,000 \\\text { Wark in process, Novernber } 30 ^ { \text {th } } & 24,000\end{array}$$
The beginning inventory was 60% complete as to materials and 20% complete as to conversion costs. The ending inventory was 90% complete as to materials and 40% complete as to conversion costs.
Costs pertaining to November are as follows:
Beginning inventory: direct materials, $54,560; direct labor, $20,320; manufacturing overhead, $15,240.
Costs incurred during the month: direct materials, $468,000; direct labor, $182,880; manufacturing overhead, $391,160.
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What is the equivalent unit cost for materials assuming Bentley uses first-in, first-out (FIFO) process costing?

A) $4.12.
B) $4.50.
C) $4.60.
D) $4.80.