Q1 criteria: - Correct calculation & display; see format/pattern in the document - Able to accept & process valid numeric types, e.g., 0, 100, 456.78 Should not allow input of negative numbers Uses while-loop only, no for/foreach/do-while/goto Will keep on running until -1 is entered Shows 'Goodbye!' when ended Question 1 (2.5 marks]: A dental Equipment Company pays its sales employees on a commission basis. The monthly salary of the sales employee is $1,000 plus 8% of their gross sales for that month. For example, a salesperson who sells $10,000 worth of Diamond instruments for dentists in a month receives 1,000 plus 8% of $10,000, or a total of $1,800. 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!". Enter sales in dollars (-1 to end): 5000 Salary is: $1400.00 Enter sales in dollars (-1 to end): 8000 Salary is: $1640.00 Enter sales in dollars (-1 to end): 9000 Salary is: $1720.00