You spent some time computing trade discounts, net cost equivalents, and single discount equivalents. Consider the series discount 20/15. a) Find the net cost equivalent for the given series discount. Write your answer as a percent, unrounded. b) Find the single discount equivalent for the given series discount. Write your answer as a percent, unrounded. c) What is the significance of the net cost equivalent? In other words, what does it tell us in terms of list price and discounted price? d) What is the significance of the single discount equivalent? What does it tell us in terms of list price and discounted price? e) Now let's suppose an item with list price $400 has series discounts 20/15. A competitor offers a final selling price of $200 for the same item. What additional discount (from the 20/15) is needed in order to meet the competitor's price? Round to the nearest tenth of a percent