Given the information below for "Table are Us" carpentry shop: a. Based on the Principle of Marginal Analysis, what is the optimal number of tables for this firm to build per day? b. Is marginal benefit Increasing, constant, or decreasing? c. What Is the repair shop's maximum total profit? Quantity of Total Total tables_built per day cost ($) benefit($) 0 . 0 0 40 75 2 90 160 150 250 220 350 5 300 455 6 390 570 7 512 690 8 640 815