12 A company ofers a discount for bulk sales of its product. The following graph models the price per unit when x units, in thousands, are sold Which interval shows the most rapid average rate of change? 50-| 40- 30 - Price per Unit ($) 0 to 5.000 units 0 to 10,000 units 20 0 to 15,000 units 0 to 20,000 units 10- 10 15 20 Number of Units in Thousands