Contribution Margin AnalysisSales Select Audio Inc. sells electronic equipment. Management decided early in the year to reduce the price of the speakers in order to increase sales volume. As a result, for the year ended December 31, the sales increased by $23,600 from the planned level of $1,169,600. The following information is available from the accounting records for the year ended December 31. Actual Planned Increase or (Decrease) Sales $1,193,200 $1,169,600 $23,600 Number of units sold 31,400 27,200 4,200 Sales price $38 $43 $(5) Variable cost per unit $6 $6 $0 a. Prepare an analysis of the sales quantity and unit price factors. Use a minus sign for any negative amounts. Select Audio Inc. Contribution Margin AnalysisSales For the Year Ended December 31 Effect of changes in sales: Sales quantity factor $ Unit price factor Total effect of changes in sales $