Question: Functions and conditions: Write a function named letter_grade that takes an integer argument, which represents a mark of a student. Return A, t mark >

Functions and conditions: Write a function named letter_grade that takes an integer argument, which represents a mark of a student. Return "A, t mark > 90, "B t 0 mark 90, 'C, if 70-mark 80, 'D, if 60-mark 70, and E' if mark 60. Return None if it is not a valid mark. A valid mark ranges from 0 to 100
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