A tool dales for $150 at a local hardware store. The tool set is on sale for 20% off the retail price, p, given by f(p)=0.80p. Devon is interested in buying the tool set and has a coupon for$30 off the price of the tool set, which can be represented by g(p)=p-30. What is the difference between the cost of using the coupon followed by the discount, f(g(p)), compared to using the discount followed by the application of the coupon, g(f(p))?