Assuming a company sells 800 units at $16 each, has variable costs of $12 per unit. The after-tax income is $1,200.
Using this formula
After-tax income=(Selling units×Selling price)-[(Variable costs×Selling price)+Fixed costs]×(1- tax rate)
Let plug in the formula
After-tax income=(800 units× $16 each)-[(800 units × $12 each)+$1200]×(1-.40)
After-tax income=$12,800-($9,600+$1,200)×0.60
After-tax income=$12,800-$10,800×0.60
After-tax income=$2,000×0.60
After-tax income=$1,200
Inconclusion the after-tax income is $1,200.
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