Demand According to economic theory, the demand x for a quantity in a free market decreases as the price p increases (see the figure). Suppose that the number x of DVD players people are willing to buy per week from a retail chain at a price of $p is given by x= 1,000 0.3p+1' 10 ≤ p ≤ 70. Answer parts (A), (B), and (C). X 500- 250- x= 1,000 0.3p+1 40 Price (dollars) 80 b) Find S(5) and S'(5). The value of S(5) rounded to the nearest hundredth is 10. The value of S'(5) rounded to the nearest hundredth is 3.2.