When Hutchinson Corp sells 15,000 units, total variable costs are $71,250 and total fixed costs are $45,000. Hutchinson can produce 0 to 38,000 units within the relevant range of production. What is the total variable cost when 23,000 units are sold?

a) $109,250

b) $154,250

c) $180,500

d) Not determinable with information given.