The "learning curve" describes the rate at which a person learns certain tasks. If a 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

t = -62.5 ln(1 - N/80

(a) According to this formula, what is the maximum number of words per minute? (Round your answer to the nearest whole number.) ________wpm

(b) Solve for N. N = _________