Design a flowchart or pseudocode for the event handler btnCalcSale_click,which calculates the total of a retail sale. Assume the program uses txtRetailPrice,a TextBox control that holds the retail price of the item being purchased, and dec TAX_RATE,a constant that holds the sales tax rate. The event handler uses the items above to calculate the sales tax for the purchase and the total of the sale. Display the total of the sale in a label named lblTotal.
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