You are a manager of a pharmaceutical rm that has a monopoly for a particular drug. Your staff has estimated the price elasticity of demand for the drug. When the price of the drug is $1,200 per dose, the price elasticity of demand is 3.0, and when the price is $400 per dose, the price elasticity of demand is 2.0. The marginal revenue of the drug when the price is $1,200 per dose is $D. (Round your answer to M0 decimal places.)