Final answer:
The student's question regarding the percentage savings on airfare requires specific pricing information that is not provided, making it impossible to calculate the exact savings percentage.
Step-by-step explanation:
The question from the student asks about calculating the percentage savings obtained from choosing a 14- to 21-day excursion airfare over a regular economy airfare for a round-trip ticket from New York to London. To find the percentage savings, one would typically divide the amount saved by the original price and then multiply by 100. However, the question does not provide specific costs for each fare type. Without the actual costs, it's impossible to calculate the precise percentage savings. The provided answer options (10.2%, 15.5%, 20.1%, 24.9%) would likely correspond to specific airfare prices that are not given in the information provided.