A dental Equipment Company pays its sales employees on a commission basis. The monthly salary of the sales employee is $1000 plus 8% of their gross sales for that month. For example, a salesperson who sells $10000 worth of Diamond instruments for dentists in a month receives 1000 plus 8% of $10000, or a total of $1800. Write a program that uses a while statement to input each salesperson's gross sales for last month and calculates and displays that salesperson's earnings. Process one salesperson's figures at a time. To stop the program the user type -1 and display the message "Goodbye