Answer:
The percent change in price is 400%
Step-by-step explanation:
Given, the ticket was $4.00 in 1999
And $ 20.00 in 2009
Let, price for 1999 be P1 = $4
Price for 2009 be P2 = $20
Percent change in price is calculated by the formula,

Substituting the values in the formula,

% change = 16/4 * 100 = 400%
Therefore, the percent change in price is 400%