uantity (# of bars) Marginal Benefit ($) Marginal Cost ($) 1 9 2 2 8 2 3 6 2 4 3 2 5 1 2 6 -2 2 Assume the above table describes the marginal benefits and costs of eating additional energy bars. The enjoyment per bar is measured by the MB column, and the MC column measures the price per energy bar. What is the cost of purchasing the 3rd bar