The subject is Economics From the data shown in Table below about demand for smart phones, calculate the price elasticity of demand from: point B to point C , point D to point E , and point G to point H .

A
60
3,000
B
70
2,800
C
80
2,600
D
90
2,400
E
100
2,200
F
110
2000 g
G
120
1,800
H
130
1,600​