Rita is entering the stage of formal operational thought. In her social studies class, she can now understand such concepts as a country's gross national product or its fertility rate.

Abstract

Explanation:

Abstract concept is the describes about ideas that are not specific and physical in nature.It provides understanding to people regarding concept symbolic behavior and principles involved in ideas or thoughts in relation with other objects.    

According to the question,Rita is understanding the abstract concept in which she can relate and perceive information about fertility rate, gross product etc due to understanding principles and relationship of ideas are not concrete in behavior.

6.3%

explanation:

the acceptance rate for yale university is 6.3%. this means that only 6 percent of people who apply actually get accepted!

answer; /// the above statement is (true);