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Consider the following

production​ function:

q = 7LK + 4L2 − (1/3)L3.

Given the following expressions for the marginal productivity of each​ input:

MPL = 7K + 8L − L2 and MPK = 7L


Assuming capital is plotted on the vertical axis and labor is plotted on the horizointal​ axis, determine the value of the marginal rate of technical substitution when K​ = 20

and L​ = 10

​(Round your answer up to two decimal places and include the proper​ sign.)

MRTS​ = ________________


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