Sandhill Corporation produces microwave units. The following per-unit cost information is available: direct materials $38; direct labour $26; variable manufacturing overhead $16; fixed manufacturing overhead $43; variable selling and administrative expenses $14; and fixed selling and administrative expenses $27. Its desired ROI per unit is $30.58. Calculate the markup percentage using variable-cost pricing. (Round answer to 2 decimal places, e.g. 15.25\%.)