Kevin is selling homemade bread with a 30% markup (1.e., the profit of each unit sold is 30% of the unit production cost). At the end of the day. his friend, Jose, is willing to buy all the unsold units if Kevin offers a discount of 80% off the selling price. What is the optimal service level (L.e., critical ratio) for selling bread? (Note: Here's an example of the discounted price, Consider a product priced at $100. The price with a discount of 20% off the selling price is $80. 28.85% 47.63% 63.14% 71.15%