Work point 4.1

1. % change in peice= (-0.4/4)100=-10%

% change n Qd = 30/600(100)= 5%

2. Priced elasiticity= %change in P/%change in Qd= %/-10=0.5, ped elastic

3. Revenue initially=4*600= 2400

revenue after price change= 3.6* 630=2268

%change in revenue= -132/2400*100=-5.5%

4-

5. No, because their overal revenue dropped 5.5%