Solution :
The contribution margin per hour :
Particulars Socks Sweaters
Selling price 25 95
Variable cost 5 35
Contribution margin 20 60
Hours per unit 5 15
CM per hour 4 4
From here, we see that the contribution margin per unit of the resources are same for the two products. So Netty can produce either one of the product, i.e. either sweater or socks.