Sandhill Corporation produces microwave units. The following per-unit cost information is available: direct materials $35; direct labour $24; variable manufacturing overhead \$18; fixed manufacturing overhead \$42; variable selling and administrative expenses $16; and fixed selling and administrative expenses $28. Its desired ROI per unit is $29. Calculate its markup percentage using a total cost approach. (Round answer to 2 decimal places, e.g. 15.25\%.)