$14)$ Lovejoy's Cake Shop makes three types of cakes: White, Chocolate, and Swirl on one assembly line that has a limit of $400$ labour hours per week. Lovejoy can sell all the cakes it can make under current operating capacity. Manufacturing information per cake for each product is as follows:

White Chocolate Swirl

Selling price $$16$ $$10$ $$20$

Variable costs $10518$

Labour hours per cake $\mathrm{.}4\mathrm{.}2\mathrm{.}4$

Required:

Determine the total weekly contribution margin when all labor hours are allotted to the product with the highest:

a$.$ Unit selling price.

b$.$ Unit contribution margin.

c$.$ Contribution per labor$-$hour.