Dana owns her own real estate agency. It is difficult to determine how much she spends on advertising for each listing because some of her advertising sources are fixed amounts each month and others are more variable in nature. She would like to analyze the following information to determine how her advertising costs behave based on the number of listings.

Month Number of Listings Advertising Cost

March 22 $15,280

April 26 $17,640

May 35 $23,145

June 42 $27,205

July 48 $30,565

August 51 $32,485

September 50 $31,835

October 56 $36,020

November 54 $34,920

Required: 1. Using the high-low-method, compute the variable cost of Danas advertising.

2. Compute the total fixed cost per month.

3. Represent the advertising costs cost function in equation form.

4. What is the expected cost if 60 listings are advertised?