What Is The RISCA Format For: The Principal's List Includes The Names Of Stu…

What is the RISCA format for: The principal’s list includes the names of students who got an average grade of at least 90 in five academic subjects. Hermin has grade of 89, 90, 88, and 92. What must he get in the 5th academic subject to be included in the list?

the average in the 5th academic subject is 89 point something