Hi$,$ please help with question $3\mathrm{.}1$ and $3\mathrm{.}2$

Question $3($Marks: $20)$Shoes Ltd$.$ manufactures three items: Sneakers, Takkies and Sandals. The table below contains information regarding these products:Sneakers $($R$/$ unit$)$Takkies $($R$/$ unit$)$Sandals $($R$/$ unit$)$Material cost$607540$Labour cost$246842$Variable overhead cost$71216$Fixed overhead cost$362311$Selling price per unit$870990650$Volume of production$120002850031200.$Fixed overheads are allocated to products based on direct labour hours.Direct labour hours are constrained and therefore limited to $140000$ hours.The direct labour rate is R$25$ per hour.Required:Q$\mathrm{.}3\mathrm{.}1$ Calculate the contribution margin per labour hour and then rank the products inorder of profitability.$(12)$Q$\mathrm{.}3\mathrm{.}2$ Calculate the number of units of each product that needs to be manufactured to$(8)$