I NEED THIS WITHIN 20 MINUTES! Solve the problem.

An airline with two types of airplanes, P 1 and P 2, has contracted with a tour group to provide transportation for a minimum of 400 first class, 750 tourist class, and 1500 economy class passengers. For a certain trip, airplane P 1 costs $10,000 to operate and can accommodate 20 first class, 50 tourist class, and 110 economy class passengers. Airplane P 2 costs $8500 to operate and can accommodate 18 first class, 30 tourist class, and 44 economy class passengers. How many of each type of airplane should be used in order to minimize the operating cost?

a. 5 P 1 planes and 17 P 2 planes
b. 11 P 1 planes and 7 P 2 planes
c. 7 P 1 planes and 11 P 2 planes
d. 9 P 1 planes and 13 P 2 planes