In its Form 10-K Skechers U.S.A., Inc. describes itself as follows: We design and market Skechers-branded lifestyle footwear for men, women and children, and performance footwear for men and women under the Skechers GO brand name... As of February 15, 2015, we owned and operated 119 concept stores, 146 factory outlet stores and 98 warehouse outlet stores in the United States, and 51 concept stores, 33 factory outlet stores, and three warehouse outlet stores internationally The popularity of Skechers' products has increased significantly in recent years. Sales increased from $1,560.3 million in 2012 to $2,377.6 million in 2014. for an increase of 52.4 percent. In the same period, operating income increased from $22.3 million to S209.0 million, for an increase of 837 percent. It should be noted that this growth was not the result of larger acquisitions of or mergers with other companies Required Write a memorandum that explains how a 52 percent increase in sales could cause an 837 percent increase in profits. Your memo should address the following: a. An identification of the accounting concept involved. b. A discussion of how various major types of costs incurred by Skechers were likely affected by the increase in its sales. c. The effect of the increase in sales on Skechers' margin of safety