Cullumber Corporation produces microwave units. The following per-unit cost information is available: direct materials $ 38; direct labour $ 26; variable manufacturing overhead $ 19; fixed manufacturing overhead $ 42; variable selling and administrative expenses $ 16; and fixed selling and administrative expenses $ 27. Its desired ROI per unit is $ 29.01. Calculate the markup percentage using variable-cost pricing. (Round answer to 2 decimal places, e.g. 15.25%.)