Sierra Company produces its product at a total cost of $110 per unit. Of this amount, $30 per unit is selling and administrative costs. The total variable cost is $88 per unit, and the desired profit is $18.70 per unit. Determine the markup percentage using the (a) total cost, (b) product cost, and (c) variable cos methods. Round your answers to one decimal place. a. Total cost % b. Product cost % c. Variable cost %