The target selling price per unit is $0.77.
We use the following formula to arrive at the answer.
Revenues = Total Costs + (Desired Profit per unit *Expected Annual sales)
= $168,000 + ($0.35*400,000)
= $168,000 + $140,000
Revenues = $308,000
Selling Price per unit = Revenues / Expected Annual Sales
= $308,000 / 400,000
= $0.77