Final answer:
The slope of the line representing the cost of manufacturing the wristbands is $100 per unit, which is the variable cost for each unit manufactured by Ppleseed.
Step-by-step explanation:
The scenario described involves Ppleseed, a tech company, incurring a fixed cost and a variable cost for manufacturing wristbands for their new watch. The fixed cost is a one-time fee, which does not change with the number of units produced, while the variable cost is per unit manufactured. In this case, the fixed cost is $1500, and the variable cost is $100 per unit. Since the slope of a line in this context represents the rate of change of the total cost with respect to the number of units produced, the slope is the variable cost of $100 per unit.