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The sales manager at Tompkins Company wants a program that calculates and displays each salesperson's commission, which is 10% of his or her sales. It also should display the total commission. Use a value-returning function to get the amount sold by a salesperson. The amount sold may contain a decimal place. Also use three void functions: one to calculate the 10% commission, another to display the commission, and another to calculate the total commission. The program should display the commission and total commission in fixed-point notation with two decimal places. Display the total commission only after the sales manager has finished entering the sales amounts. Use a sentinel value to end the program.