Astra is reviewing the proposed marketing plan to support its new line of athletic shoes. The promotion initiatives include: (1) an addition of 3 new people to the sales force with a cost of $15,000 in annual salary per person, (2) magazine advertising 10 times during a year at $10,000 per placement, (3) 121 salesforce commission on every pair of athletic shoes sold, and (4) two trade shows ($5,000 per show). Which one out of these expenditures is a fixed cost? Except the salesforce commission, the other three are fixed costs. two trade shows salesforce commission magazine advertising salestorce salary