algorithm to calculate the total and percentage of marks of 3 subjects and display the total, percentage and grade
1. Start
2. Initialize variables: mark1, mark2, mark3, total, percentage, grade
3. Input marks for three subjects: mark1, mark2, mark3
4. Calculate the total marks: total = mark1 + mark2 + mark3
5. Calculate the percentage: percentage = (total / 300) * 100
6. Check the grade based on the percentage:
- If percentage is greater than or equal to 90, set grade to "A+"
- If percentage is greater than or equal to 80, set grade to "A"
- If percentage is greater than or equal to 70, set grade to "B"
- If percentage is greater than or equal to 60, set grade to "C"
- If percentage is less than 60, set grade to "Fail"
7. Display the total marks, percentage, and grade to the user
8. End