Questions 8-10 are based on the following revenue and cost structure.: Selling price per unit: Variable cost per unit: S 100 S 40 S12,000 40% Total fixed costs: ax rate on operating income: How much sales revenues must be achieved to earn a target net income of $72,000? a. $72,000 b. S100,000 c.$132,000 d. $220,000 10