I encountered a problem when doing a past paper (june 06).
the question is as follows:
c)The schedule below shows the market demand for the product of a monopoly
QD per week(millions) 2,3,4,5,6
Price per unit (£) 6,5,4,3,2
ii) Market research has estimated that, as price falls from £5 to £4 per unit, the price elasticity of demand is (-)1.0.
Is this consistent with the data in the schedule above? explain your answer.
After i was going through the mark scheme to mark my work, it said that elasticity was (-)1.67
i cant see how they got this answer. Could some1 please explain this to me. Thanks in advance