Charter Company, which uses the perpetual inventory method, purchases different letters for resale. Character had a beginning inventory comprised of six units at $4 per unit. The company purchased five units at $6 per unit in February, sold nine units in October, and purchased five units at $7 per unit in December. If Charter Company uses the LIFO method, what is the cost of goods sold for the year?

a.) $46

b.) $43

c.) $77

d.) $89