Rami Home Builders, Inc

Rami Home Builders, Inc., has built 24 houses so far this year at a total cost to the company of $4.2 million. If the company builds a 25th house, its total cost will increase to $4.375 million. Which of the following statements is correct?

A) For the first 24 houses, the average cost per house was $170,000.
B) The marginal cost of the 25th house, if it is built, will equal $175,000.
C) If the company can sell the 25th house for at least $167,000, then it should build it.
D) The company should never build the 25th house because this increases its total cost.