Convert the ERD of the following problem into a relational model:

"Design an E/R diagram for an Instructor database. The database should organize the grading of students an instructor has in his/her various classes he/ she teaches during a semester. The information needed to be represented consists of all the classes taught by the instructor, the students in each class, the homework assignments given for each class (including sequential number, lecture they were part of, due date, and percentage in the final grade), and the grades for each student (including the numeric value and the letter grade)."