The following information is available for Department C for the month of August:

	Units		Cost
Work in process, August 1 (70% complete)	10,000
Direct materials			$36,000
Direct labor			18,000
Manufacturing overhead			24,000
Total work in process, August 1			$78,000
Started in production during August	40,000
Costs added:
Direct materials			$108,000
Direct labor			48,000
Manufacturing overhead			61,040
Total costs added during August			$217,040
Work in process, August 31 (80% complete)	4,000
Units completed and transferred out	42,000

Materials are added at the beginning of the process. Inspection takes place at the 50 percent point in the conversion process to determine spoiled units. Round unit costs to two decimal places. The company uses the weighted average cost flow assumption. Department C's conversion cost per unit using the weighted average method is

a.$2.18.

b.$2.22.

c.$2.31.

d.$3.20.