Output Total cost Total variable cost (T shirts per hour) (dollars) (dollars) 4 42 22 5 50 30 6 60 40 The table above gives information on the costs of producing T-shirts. a) What is the fixed cost of producing T-shirts? b) What is the marginal cost of increasing production from 5 to 6 T-shirts? NOTE: I've made this question a "file response" so you can upload an image file of your full mathematical calculations. This helps ensure you mall math