Dana owns her own real estate agency. She has been working hard to increase her client base. She offers the most comprehensive advertising campaign in the city and it has been paying off by the steady increase in the number of listings over the last several months. However, Dana is concerned that her extensive cost for advertising is eating into her profits. 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. 26 May Number of Advertising Month Listings Cost March 22 $15,280 April $17,640 $23,145 June $27,205 July $30,565 August $32,485 September 50 $31,835 October $36,020 November 54 $34,920 Using the high-low method, what is the fixed cost of advertising each month? a. $2,360 b. $2,074 C. $2,900 d. $1,860