Tammy buys four Barbie dolls a year if the price of a doll is $12 pel doll. The actual price of a Barbie doll is $13 per doll. The four dolls Tammy buys if the price is $12 are her

Martin, a 32-year-old human relations administrator at a university, believes that all professors over age 50 are incapable of learning the new educational technologies and are content to keep presenting their same "tired, boring" lectures. he often expresses these views to other administrators and does not encourage any of the "older" faculty members to attend professional development meetings related to new teaching approaches nor does he suggest that the university send them to any of the technology conferences. martin is exhibiting