Flowchart to calculate the total and percentage of marks of 3 subjects and display the total, percentage and grade
Here is a flowchart to calculate the total and percentage of marks for 3 subjects and display the total, percentage, and grade:
```
START
READ subject1_mark
READ subject2_mark
READ subject3_mark
SET total_marks = subject1_mark + subject2_mark + subject3_mark
SET percentage = (total_marks / 300) * 100
IF percentage >= 90 THEN
SET grade = "A+"
ELSE IF percentage >= 80 THEN
SET grade = "A"
ELSE IF percentage >= 70 THEN
SET grade = "B"
ELSE IF percentage >= 60 THEN
SET grade = "C"
ELSE IF percentage >= 50 THEN
SET grade = "D"
ELSE
SET grade = "F"
DISPLAY "Total Marks: " + total_marks
DISPLAY "Percentage: " + percentage + "%"
DISPLAY "Grade: " + grade
STOP
```
Note: This flowchart assumes that the maximum marks for each subject is 100 and the total maximum marks for all 3 subjects is 300.