The figures are invented. Two brands of bottled juice each sell 800 bottles a week at $5.00. Both firms raise their price by 20% to $6.00. Sales of brand A fall by 5% and sales of brand B fall by 30%. (i) Calculate the change in weekly total revenue for brand A. [3] (ii) Explain why total revenue falls for brand B. [2]

Paper 2-style short part (standalone practice; not an IB question).