Hello In this question in kaplan kit book said : A product has a prime cost of $12, variable overheads of $3 per unit and fixed overheads of $6 per unit. ask if pricing policy is “Net margin of 14% on selling price ” Our answer is 21 × 100/86 = $24.40 my question is why net margin is 21 and is not 12 + 3= 15