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\fThe marginal price for a weekly demand of x bottles of shampoo in a drugstore is given by the function shown below. Find the price-demand equation if the weekly demand is 150 when the price of a bottle of shampoo is $2. What is the weekly demand when the price is $6.50? , - 6,000 px)= (3x+50) Find the price-demand equation. (Type an equation.) Find the weekly demand when the price is $6.50. bottles (Round down to the nearest whole number.)