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) $345 Contribution margin at standard costs $1,015 Compute the revenue, sales price, and the sales volume variances. Revenue variance Sales price variance Sales volume variance