the corata appliance manufacturing corporation manufactures two vacuum​ cleaners, the standard and the super. the following information was gathered about the two​ products: standard super budgeted sales in units ​2,700 900 budgeted selling price ​$600 ​$1,700 budgeted contribution margin per unit ​$700 ​$1,050 actual sales in units ​3,000 ​1,200 actual selling price ​$650 ​$1,680 what is the total salesmix variance in terms of the contribution​ margin? (round intermediary calculations to two decimal​ places.)