Microsoft Corporation sells three types of software: Windows, Office, and Azure. The selling price and variable cost per unit for each software are as follows:

Software	Selling Price per Unit ($)	Variable Cost per Unit ($)
Windows	$200	$50
Office	$150	$40
Azure	$300	$100

If the sales mix is 50% Windows, 30% Office, and 20% Azure, calculate the weighted average selling price and contribution margin per unit.