Sales mix is Select one: a. the mix of variable and fixed expenses in relation to sales. b. a measure of leverage used by the company, O c. the trend of sales over recent periods. d. the relative percentage in which a company sells its multiple products. Sales mix is Select one: a. the mix of variable and fixed expenses in relation to sales. b. a measure of leverage used by the company, O c. the trend of sales over recent periods. d. the relative percentage in which a company sells its multiple products