An end-of-aisle price promotion changes the price elasticity of a good from 2 to 3. Suppose the normal price is $28, which equates marginal revenue with marginal cost at the initial elasticity of -2.

What should the promotional price be when the elasticity changes to -3? (Hint: In other words, what price will equate marginal revenue and marginal cost?)

A.$29.40

B.$21.00

C.$14.70

D.$25.20