Alex's Pizza is a budget take-away pizza shop in Sydney. Alex focuses on three high-demand pizzas and charges $12/pizza for all three, regardless of the cost to produce them. The following tables sets out Alex's budget and actual results for sales in July 2021:

Budget for July 2021

Pizza Variable cost/ pizza sales volume

Ham & Pineapple $3 500

Pepperoni $4 600

BBQ chicken $5.80 450

Actual data for July 2021

Pizza Variable cost/ pizza sales volume

Ham & Pineapple $3.10 550

Pepperoni $4.05 610

BBQ chicken $6.20 425

Part a) Find thetotal sales-volume variance, total sales-mix variance and thetotal sales-quantity variancefor July 2021. (show working)

Part b) Explain to Alex what the variances indicate.