5 Serra Company produces its product at a totat cost of $70 per unit, Of this amount, 520 per unst is seling and administrative costs, The total variable cost is 556 per unit, and the desired prolit is $15.40 per unit. Determine the markup percentage using the (a) total cost, (b) product cost, and (c) variable cost methods. Round your answers to one decimal place. a. Total cost b. Product cost c. Variable cost