I am having trouble with finding the marginal cost of my assignment and how to graph it all

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I am having trouble with finding the marginal cost of my assignment and how to graph it all. I included the information as follows for quanties 3 and 4:

quantity: 3, 4

total fixed cost: 30

total cost: 150, 255

total variable cost: 120, 225

average fixed cost 10, 7.5

average total cost: 50, 63.75

average variable cost: 40, 56.25