To solve for units sold at an income of $200,000:
First, I would subtract the variable cost of $8 from the unit sales price of $18 dollars which gives you $10.
Unit profit = $10
Fixed costs = $200,000
How many units need to be sold to earn an income of $200,000?
40,000 units x $10 = $400,000 - $200,000 = $200,000
40,000 units need to be sold to earn an income of $200,000.