algebra

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The learning curves describes the rate at which a person learns certain tasks. If person sets a goal of typing N words per minute (wpm), the length of time t (in days) to achieve this goal is given by
a) according to this formula what is the maximum number of words per minute?
I have A correct at 80. How do I find b solve for N so N= what I can not get this part. Thank you for you help
t= - 62.5 In (1-N over 80)

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