13. X Company's cost of goods sold (COGS) includes direct materials, direct labor, depreciation on production equipment, and factory rent. The company's selling, general, and administrative (SGRA) costs include sales office rent, sales staff salaries, and sales commissions. When sales volume increases by 15% in the short term, which of the following is true for the company's costs: fotal COGS total SG&A costs LA. increase by 15% no change B. I no change increase by 15% no change no change increase by 15% increase by 15% E not enough information not enough information