In Python, use only some or all of the following concepts: decision structures, repetition structures, functions, and files. Write a program that reads five test scores from a file called "grades.txt". The program should display a letter grade for each score and the average test score. Write the following functions in the program: grade_average. This function should accept five test scores as arguments and return the average of the scores. letter_grade. This 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 90 - 100 A 80 - 89 B 70 - 79 C 60 - 69 D Below 60 F The grades.txt file should test all possible grades

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