Please help:

The list price of an iPod speaker is $67.50. It is on sale for 20% off and there is a 6% sales tax. The store calculates the sales tax on the $67.50 and then takes 20% off the total. Jonathan wants them to take the discount first and then calculate the tax, reasoning that the tax will then be calculated based on the lower price and he will pay less.

1. Is Jonathan correct? How much will he pay each way?
2. How do these results compare with the problem you solved in the discussion activity?

I have to show the actual work and I don't know how. Please help....