The demand function for a Christmas music CD is given by q = 0.4(415 – p) where q (measured in units of á hundred) is the quantity demanded per week and p is the unit price in dollars. (a) Evaluate the elasticity at 20. E(20) (b) Should the unit price be lowered slightly from 20 in order to increase revenue? ? (c) When is the demand unitary? p = dollars (d) Find the maximum revenue. Maximum revenue = hundreds of dollars

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Q: 6) (-1)" () 100

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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.