$4\mathrm{.}27$ Variance analysis of contribution margin, multiple products. Debbie's Delight, Inc, operates a chain of cookie stores. Budgeted and actual operating data of its three Calgary stores for August $19\_7$ are as follows:

Budget for August

$\backslash$table$[[,\backslash$table$[[$Selling Price$],[$per Kilogram$]],\backslash$table$[[$Variable Costs$],[$per Kilogram$]],\backslash$table$[[$Contribution$],[$Margin per$],[$Kilogram$]],\backslash$table$[[$Sales Volume$],[$in Kilograms$]]],[$chate chip,$$4\mathrm{.}50,$$$2\mathrm{.}50,$$$2\mathrm{.}00,45,000],[$al raisin,$5\mathrm{.}00,2\mathrm{.}70,2\mathrm{.}30,25,000],[$nut$,5\mathrm{.}50,2\mathrm{.}90,2\mathrm{.}60,10,000],[$chocolatc$,6\mathrm{.}00,3\mathrm{.}00,3\mathrm{.}00,5,000],[$Aamia nut,$6\mathrm{.}50,3\mathrm{.}40,3\mathrm{.}10,15,{000}_{?}$Required:

$1)$ Compute the individual product and total sales volume variances for August.

$2)$ Compute the individual product and total sales quantity variances for August.

$3)$ Compute the individual and total sales mix variances for August.