sales variances presented is information pertaining to an item sold by winding creek general store: actual budget unit sales 145 115 unit selling price $27 $23 unit standard variable costs (20) (20) unit contribution margin $7 $3 revenues $3,915 $2,645 variable costs (2,900) (2,300) contribution margin at standard costs $1,015 $345 compute the revenue, sales price, and the sales volume variances.