13) Create a Nested IF Function to calculate the Grades. Use the following Information; 1. If the Total is greater than equal to 85 , then the student gets an A+ 2. If the Total is greater than equal to 80, then the student gets a A 3. If the Total is greater than equal to 75, then the student gets a B+ 4. If the Total is greater than equal to 70, then the student gets a B 5. If the Total is greater than equal to 60, then the student gets a C+ 6. If the Total is greater than equal to 50, then the student gets a C 7. If the Total is greater than equal to 40, then the student gets a D 8. If the Total is greater than equal to 30, then the student gets a E 9. If the Total is less than 30, then the student gets a F 10. False part should display Invalid mark if some other number is entered apart from 0 to 100

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