Oriole Corporation produces microwave units. The following per-unit cost information is available: direct materials $34; direct labour $26; variable manufacturing overhead $18; fixed manufacturing overhead $42; variable selling and administrative expenses $12; and fixed selling and administrative expenses $28. Its desired ROI per unit is $31.70. Calculate the markup percentage using variable-cost pricing. (Round answer to 2 decimal places, e.g. 15.25%.) Markup percentage %