Curl Hair Products produces hair care products with a small crew of 5 employees. On a recent day, 420 product boxes were produced and shipped during an 8-hour shift. a. What is the productivity per labor-hour? Answer should include units and should be expressed in a sentence. Show all calculations. b. Next day, the team had only 4 employees. They produced and shipped 360 product boxes. What is the productivity per labor-hour? c. Has the productivity increased or decreased? What is the percentage of productivity change? (Note: Percent change = (New-Old)/ Old x 100%)