If Pamela's Purses LLC produces 300 purses when the price of a purse is $80 and 900 purses when the price of a purse is $120, then (using the midpoint formula) the price elasticity of purse supply, Es, is

Group of answer choices

0.9.

0.4.

2.5.

1/6 0.1667.

9.0.

1.5.

0.1.

2/3 0.667.