Sheridan Corporation produces microwave units. The following per-unit cost information is available; direct materials $35; direct labour $24; variable manufacturing overhead $18; foxed manufacturing overhead $43; variable selling and administrative expenses $16; and fixed selling and administrative expenses $26. It s desired ROI per unit is $28.65. Calculate the markup percentage using variable-cost pricing. (Round answer to 2 decimal ploces, es. 15.25\%)