Consider the following costs of an airplane of the Tedu Airlines company. Item Initial cost Service life Salvage value Crew costs per year Fuel cost per mile Landing fee Maintenance per year Insurance cost per year Catering per passenger trip Cost $12,000,000 15 years $2,000,000 $225,000 $1.10 $250 $237,500 $166,000 $75 The company flies three round trips from Ankara to Amsterdam per week, a distance of 2,100 miles one way. How many round-trip passengers must be carried on average in order to justify the use of the airplane if the first-class round-trip fare is $4,500? The firm's MARR is 12%. Hint: Find annual equivalent cost