Suppose a Dentist Has Total Revenue of $320,000, and His

Suppose a dentist has total revenue of $320,000, and his total costs are $250,000 for the year. Also suppose the dentist left a job paying $112,000 a year to start his own practice. What is the dentist's accounting profit?

A) -$28,000
B) -$42,000
C) $182,000
D) $70,000
E) $112,000