airlines flies passengers roundtrip. it has two types of passengers: business and vacation. it noted the following info:

business vacation

roundtrip ticket price $300 $100

variable cost per roundtrip $50 $10

percent of travelers 25%. 75%

airlines pays $100,100 per month for aircraft rental and landing rights.

1. compute airlines overall weighted average contribution margin per passenger

2. compute the number of business passengers that airlines will have when it generates a profit of $0.