An item with a holding cost of $500 per year can be shipped by air in 1 day, costing $100, or by ground in 4 days, costing $25. Assuming the holding costs of $500 per year are based on an operational year of 365 days, which is cheaper and by how much? a. Ground and air have the same total cost b. Ground is cheaper by $75.00 C. Ground is cheaper by $70.89 d. Ground is cheaper by $72.26