Suppose that a $3$D printing firm has $6$ workers. The total product of $6$ workers is $770$ plastic models per month. The hiring of the fifth and sixth workers increased the total product by $90$ and $40$ plastic models, respectively.

Assume that all the workers have the same skills and productivity, other things being equal. Calculate the marginal product of the worker that was hired first if the firm owns $43$D printers? 

 

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