Apply the Equimarginal Principle to emission reductions from an emission tax. Now imagine there are two firms with different cost functions for emission reductions. TC₁(r₁)=r₁² MAC₁ (r₁)=2r₁ TC₂(r₂)=3r₂² MAC₂(r₂)=6r₂ Imagine each firm is currently emitting 20 tons for a total of 40 tons. Assume it has already been determined that the societally efficient amount is 20 total tons emitted. 1. Imagine an equiproportional cutback such that each firm is forced to reduce by 10 tons. What is the total cost of the 20 ton reduction?