250 l+2p the price of $2. Based on this, how much should the price be reduced in order to sell one more unit? 3. If demand (x units) for an item that sells at p dollars per unit is x = , nd dpfdx at 4. Demand (sales) for a certain type of toy is found to be D(p) = 400 - 60p toys per week at the unit price 35;). At this price, suppliers are willing to produce S( p) = 10 p2 toys per week. (21) Find the equilibrium price (where suppbl equals demand). (b) Find de'dp (the marginal revenue with respect to price) at the equilibrium price