Evaluate the marginal cost of expanding Pfizer's pharmaceutical production line.

Cost Components	Fixed Costs ($)	Variable Costs per Unit ($)	Production Volume (units)
Pharmaceutical Production	4,500,000,000	5	800,000,000

Requirements:

Calculate the marginal cost per unit.

Determine the break-even point for the pharmaceutical production line expansion.

Analyze how changes in production volume affect the marginal cost.

Provide recommendations for optimizing pharmaceutical production costs.