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The hearing aid battery market has been quietly, but steadily,growing. This growth is attributed to an aging population and theimprovement in hearing aid technology. Zinc air replacementbatteries use air outside the battery as a source of power. Thereis a tab on the battery which seals the air holes to ensurefreshness until the customer is ready to use the battery. Toactivate the battery, simply remove the tab, wait one minute toallow air to enter and activate the ingredients, and insert thebattery into your hearing air. Zinc air batteries last 3 to 21days, depending on the actual hearing aid and battery size. Costcois a major competitor in this market. In 2010 Costco reported 11.6million zinc battery customers, who purchased a total of $ 1.56billion of disposable hearing aid batteries. In the United Statesthere were 54.8 million disposable hearing aid battery customers,who purchased $ 4.69 billion in this category. Calculate the heavyusage index for Costco customers. Report your answer rounded to twodecimal places.
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