Suppose the percent of the total work force that is female is given by p(t) = −0.0033t2 + 0.49t + 33
where t is the number of years past 1970.

(b) From the equation, identify the maximum point on the graph of
y = p(t).
(Round your answers to two decimal places.)
(t, y)
(c) In what year is the percent of women workers at its maximum, according to this model?