Answer:
total profit gained by airline = $14000
Step-by-step explanation:
Given data:
total ticket sell 120
per ticket cost $200
total earning by selling = 12*200 = $24,000
unit cost of flying a passenger is $80
cost of flying for 100 passeneger = $80*100 = $8000
let x is the number of passenger between 91 and 100
if 91\leq x\leq 100 , therefore all passenger get the seat
hence profit of the airline is

if
then (x-100) will not get the seat
therefore airline has to pay $300(x-100)
profit for the airline will be = 24000 - 8000 - 300(x-100)
= $46000 - $300x
for average profit to the airline, add from 91 to 120 and divide by 120 to 92=1

after solving we get
= $14020
= $14000