Step-by-step explanation:
kindly find attached a table of how revenue relates to price.
i is used for count increments of $15.
P=200-15i
COST for flying 1 person was given at $100, for ONE PERSON.
KEY IDEA: P=r-c, PROFIT is revenue minus cost, but understand the cost will be for all ticket buyers who are to fly.
As your description gives, P is for-profit and p is for the price of a ticket.
(a) profit in terms of number of tickets sold;
p=r-c
n for a count of tickets
p=r-c*n
p=(200-15i)n-100n
No way getting away from the unknown ticket price. Otherwise, you could simply say
p=pn-100n