C sharp please

7.28 (Converting Grade Averages to a Four-Point Scale) Write method QualityPoints that in- puts a student's average and returns 4 if the student's average is 90-100, 3 if the average is 80-89, 2 if the average is 70-79, 1 if the average is 60-69 and o if the average is lower than 60. Incorporate the method into an app that reads a value from the user and displays the result