Pl work out my problems

intermediate(ipc)course (no) (1460 Points)

08 March 2012  

as the prie of a ommodity rises from 10 to 12,its demand falls from 100 units to 50 units.calculate elasticity of demand.

a).4                                                                                                                           b).3

 c).1                                                                                                                           d).2