Answer:def GPAcalc(letterG):if "a" in letterG.lower():return 4elif "b" in letterG.lower():return 3elif "c" in letterG.lower():return 2elif "d" in letterG.lower():return 1elif "f" in letterG.lower():return 0else:return("Invalid")letterGrade = input("Enter your Letter Grade: ")grade = GPAcalc(letterGrade)print("Your GPA score is: " + str(grade))Explanation:yuh yuh...

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