USAGE INDEX. Buckle Beverage is sharing customer and market data on its operations in Brazil. Buckle Beverage has sales of $55 million in Brazil, but total spending on beverages by Buckle's customers was twice that much. In Brazil, other brands' total sales all together was 10 times Buckle's sales. A solid 10% of all Brazil beverage buyers bought Buckle at least once. Calculate USAGE INDEX for Buckle Beverage buyers. (Report your answer as a percent. Rounding: tenth of a percent.)