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Consider the following production function: 1 q = 9LK + 5L2 - []L3. Given the following expressions for the marginal productivity of each input: MPL = 9K + 10L L2 and MPK=9L 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 = 30 and L = 15. (Round your answer up to two decimal places and include the proper sign.) MRTS =