Angle Silva has recently opened The Sandal Shop in Brisbane, Australia, a store that specializes in fashionable sandals. In time, she hopes to open a chain of sandal shops. As a first step, she has gathered the following data for her new store: $ 26 13 13 $ Sales price per pair of sandals Variable expenses per pair of sandala Contribution margin per pair of sandals Fixed expenses per year Building rental Equipment depreciation Selling Administrative Total fixed expenses $ 3,900 6,500 3,900 11,700 $ 26,000 refer to the original data. During the first year, the store sold only 3,000 pairs of sandals and reported the following operating ults: Falen (3,000 pairs) Fariable expenses Contribution margin Fixed expenses fet operating income $ 78,000 39,000 39,000 26,000 $ 13,000 a. What is the store's degree of operating leverage? b. Angie is confident that with a more intense sales effort and with a more creative advertising program she can increase unit sales by 50% next year. Using the degree of operating leverage, what would be the expected percentage increase in net operating income if Angie is able to increase unit sales by 50%