Based on the information given the desired profit per unit is $0.14 per unit.
First step is to find the unit using this formula
Units=Target sales revenue / Target selling price per unit
Units=$850500 / $4.05
Units =210,000
Second step is to calculate the desired profit per unit using this formula
Desired profit per unit=Target selling price per unit - (Target costs / Units)
Desired profit per unit=$4.05-($821250 / 210,000)
Desired profit per unit=$4.05- $3.91
Desired profit per unit=$0.14
Inconclusion the desired profit per unit is $0.14 per unit.
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