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turn the .6x+ .008x to 600+ 8x to get dollars per ton. to find the dollars for the first 50 ton, take the integral of 600+8x from 0 to 50, so 600x+(8x^2)/2 from 0 to fifty gets the marginal cost 600(50)+(8(50)^2)/2= 40000, then add your start up cost for the final answer. 100000+40000+140000. For the second part, do the integral from 0 to 100, add the start up cost then minus the answer from part one, 600(100)+(8(100^2))/2+100000=200000, 200000-140000=60000.

Calculus

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Any kind of calculus question you want. I also have answered some questions in Physics (mass, momentum, falling bodies), Chemistry (charge, reactions, symbols, molecules), and Biology (reproduction, insusion of chemicals into bloodstream).

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