15. If 40% of the students in your class are women and 50% of the women have brown hair,
which of the following describes the percentage of the students in your class who are
women with brown hair?
(a) (40%) (50%) = 20%
(b) 50% -40% = 10%
(c) 40% + 50% = 90%
(d) The percentage of women cannot be determined from the given information.