Write a program that calculates and prints the take-home pay for a commissioned sales employee. Allow the user to enter values for the name of the employee and the sales amount for the week. Employees receive 7% of the total sales as their commission. Use 18% as the federal tax rate.

Retirement contribution is 15%. Use 9% as the social security tax rate.

Define appropriate constants. Write input, display, and calculation methods for each of the deductions. Your final output should display all calculated values, including the total deductions and all defined constants.