The function P(a:) = 432 l 25753: 6500 gives the profit when :6 units of a certain product are sold. Find a) the prot when 60 units are sold dollars b) the average prot per unit when 60 units are sold dollars per unit c) the rate that prot is changing when exactly 60 units are sold dollars per unit d) the rate that prot changes on average when the number of units sold rises from 60 to 120. dollars per unit e) The number of units sold when prot stops increasing and starts decreasing. (Round to the nearest whole number if necessary.) units