P-SA. Net Income Planning Superior Corporation sells a single product for $75 per unit, of which $42 is contribution margin. Fixed costs total $100.800 and net income before income tax is $28.800 Required Determine the following (show key computations): The present sales volume in dollars. b The break-even point in units. The sales volume in units necessary to attain a net income before income tax of $39.000. d. The sales volume in units necessary to attain a net income before income tax equal to 20% of sales revenue The sales volume in units necessary to attain an after-tax net income of $43.720 if the tax rate is 40%