Exercise 2: Q1 following grade are wrong. right one is 90-100, A | 70-89, B

Following correct grade:
90-10, A
70-89, B
60-69, C
50-59, D
0-49, F

04_Day_Conditionals/04_day_conditionals.md

@@ -324,7 +324,7 @@ isRaining
 ### Exercises: Level 2
 
 1. Write a code which  can give grades to students according to theirs scores:
-   - 80-100, A
+   - 90-100, A
    - 70-89, B
    - 60-69, C
    - 50-59, D