๐ŸŒณBuilding Decision TreesWORKSHOP
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Step 1

**Grade Calculator**: Write a function `letter_grade(score)` that returns a letter grade: A (90-100), B (80-89), C (70-79), D (60-69), F (below 60). Test it with a few values and print the results.

โŒ˜ Enter (Mac) ยท Ctrl+Enter (Win/Linux)