what is the correct answer?

5. Assume that in October you bought a P4,500 nonrefundable airline ticket * 1 point to Boracay, for a 5-day/4-night vacation. You now have an opportunity to buy an airline ticket for a 5-day/4-night Palawan for P4,000 that includes an island tour ticket. The price of your island tour ticket for the Boracay vacation would be P3,000. The price of a hotel room in Boracay is P1,800 per night. The price of a hotel room in Palawan is P1,500 per.night. Which of the following costs is not relevant in a decision of whether to proceed with the planned trip to Boracay or to change to a trip to Palawan? a. The P4,500 airline ticket to Boracay b. The P4,000 airline ticket to Palawan c. The P3,000 island tour ticket in Boracay d. The P1,800 per night hotel room in Boracay