Chloe's Cafe bakes croissants that it sells to local restaurants and grocery stores. The average costs to bake the croissants are $0.65 for 2,500 and $0.60 for 5,000. Required: If the total cost function for croissants is linear, what will be the average cost to bake 4,200? (Do not round intermediate calculations. Round your final answer to 4 decimal places.) Average cost