Firm ZX is currently producing 50 units of output at an average cost of $18. Customer A is willing to offer Firm ZX $220 to produce 5 more additional units. Firm ZX's average variable cost and average fixed cost of producing 55 units is $20 and $2. Compute MR and MC to evaluate this offer? The marginal cost of the five additional units is $ _ E The marginal revenue of the five additional units is $_ E