need help with this question

Norman Dowd owns his own taxi, for which he bought a $13,000 permit to operate two years ago. Mr. Dowd earns $39.000 a year operating as an independent but has the opportunity to sell the taxi and permit for $46,000 and take a position as dispatcher for Carter Taxi Co. The dispatcher position pays $37,000 a year for a 40 -hour week. Driving his own taxi, Mr. Dowd works approximately 55 hours per week. If he sells his business, he will invest the $46,000 and can earn a 11 percent return. Required a. Determine the opportunity cost of owning and operating the independent business: b. Calculate the earnings of Norman Dowd operating as an independent and the earnings of Norman Dowd working as a dispatcher. Based solely on financlal considerations, should Mr, Dowd sell the taxi and accept the position as dispatcher