Final answer:
The percent increase from $300 to $375 is 25%. If an additional $50 baggage fee is charged, the percent increase becomes about 41.67%.
Step-by-step explanation:
The percent increase can be calculated by finding the difference between the new cost and the old cost, and then dividing that difference by the old cost.
In this case, the difference is $375 - $300 = $75.
Dividing $75 by $300 and multiplying by 100 gives a percent increase of 25%.
If an additional $50 baggage fee is charged, we need to consider the new total cost.
The new total cost would be $375 + $50 = $425.
The difference between the new total cost and the old cost is $425 - $300 = $125.
Dividing $125 by $300 and multiplying by 100 gives a percent increase of about 41.67%.