Carla Vista Corporation produces microwave units. The following per-unit cost information is available: direct materials $37; direct labour $25; variable manufacturing overhead $16; fixed manufacturing overhead $40; variable selling and administrative expenses $12; and fixed selling and administrative expenses $27. Its desired ROI per unit is $29.30. Calculate the markup percentage using variable-cost pricing. (Round answer to 2 decimal places, e.g. 15.25%..