When diet faddists gulp 205 million unsweetened as “No-Carb” milkshakes of $2.30 apiece, if cut back to 155 million per week while the price rises to $3.70 every, the price elasticity of their demand for shakes equivalents: (w) 0.3. (x) 0.6 (y) 0.9. (z) 1.2.
How can I solve my Economics problem? Please suggest me the correct answer.