Schweser Notes: Economics Section 13, Income Elasticity Example

CFA Level I Economics
#1

This is the example on page 35 of the Schweser Notes for the Economics section, specifically LOS 13.L.

I do not understand why the income (in thousands) and the average price of automobiles is scaled down to 40 and 22, respectively, when they are actually 40000 and 22000. Can anyone explain why they just do away with the multiple of 1000 while leaving the other variables unchanged?

#2

I tried to solve it and then I realise your complain. I think it should have been stated that the value s in the equation is in thousand. Next time I think you should have copy the question