At the end of the semester, students often wish to know what grade they need
on the final exam to get an A in the course. Write a program that prompts for the user’s grades
on exam 1, exam 2, and the homework and from this determines the grade necessary on the final
to get an overall average in the course of 90.
Exam 1 & 2 are 25 % each. Homework = 15 % & final exam = 35 %.