题目选项分析

The mayor of Coast Town has determined that the best way to pay for the construction of a new library is to charge all residents and non-residents a fee for visiting Coast Town's well-regarded beach. The mayor reasons that at current levels of visitation, the revenue generated from the beach visitation fee will pay for the new library within three years.

Which of the following pieces of information would be most useful in evaluating the mayor's conclusion?

【选项】The average level of household income of residents in Coast Town.