he demand for a company's e-reader can be approximated by q(p) = 21e−0.02p million units per year  (20 ≤ p ≤ 500), where p is the price charged for the e-reader. Obtain a formula for price elasticity of demand E. E =  0.02p       Calculate its value at the two endpoints of the given range of prices. E(20)= E(500)=  Is the price that would maximize annual revenue within the range of prices shown? YesNo     How would you know this without calculating that price? The value  E(20)       1  and  E(500)       1.  Therefore the price that would maximize revenue would result in E = 1, and      lie between 20 and 500

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Differential Equations

Have you ever observed the movement of the satellites and rockets or how the planets go around the sun in their orbits? How will you determine their motion? Definitely they follow some scientific laws and these kinds of problems are framed as differential equations.