The correct answer to this open question is the following.
Although the question does not include options, we can say the following.
Shilah is assigned a small group project. She groans when the teacher announces that the project will be given a single group grade (and that she cannot receive an individual grade) because she knows that working in teams or groups is likely to cause conflicts and problems.
And this is a continual occurrence in many classrooms when the teacher asks students for teamwork and announces that the grade would not be individual but is going to be a group grade. Students know each other and know who is a hard worker and who is lazy.
In this case, Shilah knows that some of the group members are known to be lazy and do not commit to the group effort. And sometimes students like Shilas have to do extra work or the work of others in order for the group to have a good grade.
The rule of 72 says that to find the number of years required to double your money at a given interest rate, you just divide the interest rate into 72.
