Chuman Corporation produces stove top units. The following per-unit cost information is available: direct materials $37; direct labour $26; variable manufacturing overhead $16; fixed manufacturing overhead $42; variable selling and administrative expenses $13; and fixed selling and administrative expenses $29. Its desired ROI per unit is $31. Calculate the markup percentage using variable-cost pricing. (Round answer to 2 decimal places, e.g. 15.25%.)