a) If the cost of the ticket is $360 now, we can take as the 100% the $250 from two weeks ago to get the following:

therefore, the percent increase is the difference between 100 and 144, then, we have that in this case, the percent increase is 44%
b)If the airline also charges a $50 fee, then the new total is:

then, the percent increase is the following:

therefore, the percent increase is 164 - 100 = 64%