PROBLEM PLEASE CLICK ---I've added a picture of the problem I am trying to solve, to make it easier to understand.
With this sort of problem, I do not understand where the numbers needed for the elasticity formula should come from with just having a demand function.
a) Calculate the elasticity of demand with respect to price at p=6
c) Calculate (with the computed elasticity value) the estimated change in demand after a rise in prices of 20% (base price p = 6 ).
also with c)is all i do to calculate multiply the result of a) with the 20%?