Illustrate Polya's Four Step Process in Solving the Following Problem:

Suppose an item is on sale at a 20% discount but there is a 5% state sales tax.  Is the customer better off if the discount is computed before the tax or if the tax is computed before the discount?  Which method of computation would the business owner prefer?

Understand the problem and make a guess:

Devise a plan:

Carry out the plan:

Look back:

Work through the exercises in Activity Set 6.3 using "percent grids" for exercises 2, 4, 5, 6.