Write a program that asks the user to enter five test scores. The program should display a letter grade for each score and the average test score. Write the following functions in the program: calc_averageThis function should accept five test scores as arguments and return the average of the scores. determine_gradeThis function should accept a test score as an argument and return a letter grade for the score based on the following grading scale: Score Letter Grade 90100 A 8089 B 7079 C 6069 D Below 60 F