United Furniture buys reclining rocking chairs at $550 less 40% and 10%. The price is marked up to allow for overhead of 50% of cost and profit of 35% of cost. The unit on display in the store acquired a stain. What rate of markdown from the regular price can the store offer on the display unit if it is to recover only half of the unit overhead costs? (Round your answer to one decimal place.) Rate %