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calculateTax
Required Parameters: string $stateprovince
Optional Parameters: char $exempt
Returns: None
Description: This function calculates the sales tax rate for a given state or province, and stores it, along with the unique row identifier of that state's record, in the $_SESSION array. The $exempt value can either be 'Y' or 'N.'
function calculateTax($stateprovince, $exempt = 'N')
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