Write a program that determines a students grade. The scale is 90 100 = A, 80 89 = B, 70 79 = C, 60 69 = D, and anything below is an F. This program is for a teacher who curves her grades. She takes the lowest grade earned in the class and subtracts it from the highest grade in the class. The difference is divided by 4, and the result is added to a students number grade. Prompt the student for his/her number grade (before being adjusted by the curve), as well as for the highest number grade in the class and the lowest number grade in the class. The final printed result will be the students own letter grade. Use the conditional set-up if / elif / else. An approach is given to you in a file in Week 2. Do not follow it to a T. Make some things differently and use your imagination. Your file name should be your last name, first name, Program 2-2.