Marketing Addis prepares marketing plans for growing businesses. For 2017, budgeted revenues are $1,500,000 based on 500 marketing plans at an average rate per plan of $3,000. The company would like to achieve a margin of safety percentage of at least 45%. The company’s current fixed costs are $400,000 and variable costs average $2,000 per marketing plan. Which of the following changes would help Marketing Docs achieve its desired margin of safety? a) The average revenue per customer increases to $4,000. b) The planned number of marketing plans prepared increases by 5%. c) Marketing Addis purchases new software that results in a 5% increase to fixed costs but reduces variable costs by 10% per marketing plan.