Write an C program that computes the score needed on a final exam (out of 100) to achieve a desired grade in a course. The program should interact with the user as
follows:
Enter desired grade> B
Enter minimum score required for the desired grade> 79.5
Enter current average score in course> 74.6
Enter how much the final exam counts as a percentage of the course grade> 25
You need a score of 94.20 on the final exam to get a B.
In the example shown above, the final exam counts as 25% of the course grade.