Explanation:
the original price was $225.
that is the 100% we are basing on.
the new price is $340.
the difference is 340 - 225 = $115
to know the % increase we need to calculate how many % of the original 100% are these $115.
1% = 100%/100 = 225/100 = $2.25
$115 are as many % as 1% fits into it :
115 / 2.25 = 51.11111111...% ≈ 51%
if we need to include the additional $50 bags fee, then the price difference is not $115 but $165.
165/2.25 = 73.33333333...% ≈ 73%
the percent increase of the ticket is about 51%.
the percent increase with the baggage fee is about 73%.