everything in the program is working well but the calculation of the cgpa is not. I want this problem to be solved by calculating the cgpa in the right way

def GPA(score):

if(score>=89.5):

return "4.0"

if(score<=89.49 and score>=86.50):

return "3.7"

if(score<=86.49 and score>=83.50):

return "3.3"

if(score<=83.49 and score>=79.50):

return "3.0"

if(score<=79.49 and score>=76.50):

return "2.7"

if(score<=76.49 and score>=73.50):

return "2.3"

if(score<=73.49 and score>=69.50):

return "2.0"

if(score<= 69.49 and score>=66.50):

return "1.7"

if(score<=66.49 and score>=63.50):

return "1.3"

if(score<=63.49 and score>=59.50):

return "1.0"

else:

return "0.0"

def report(total,advisor):

if(total>90):

print("Excellent")

if(total<90 and total>79):

print("Very Good")

if(total<80 and total>69):

print("Good")

if(total<70 and total>59):

print("Average")

if(total<60 ):

print("A disappointing GPA this semester. must try much harder next semester to imporve your GPA.")

print("You must talk to your student advisor,"+advisor +", as soon as possible")

name =input("What is your name? ")

studentID = input("what is your student H i/d number? ")

print("SEMESTER GRADE REPORT FOR:")

print("------******-------")

major=input("what is your major? ")

advisor=input("what is the name of your student advisor? ")

coordinator=input("what is the name of your programme coordinator ? ")

print("-------------")

score=[]

total=0.0

for i in range (0,5):

sc=float(input("what is your score for subject %d? "%(i+1)))

score.append(sc)

print("-------------")

for i in range (0,5):

total1=sum(score)

print("Your score for subject %s and your GPA score for subject %d is: %s" %(str(score[i]),(i+1) ,GPA(score[i])))

score.append(sc)

print("------*******-------")

avg=total/ len(score)

#print(avg)

print("Your cummulative GPA (CGPA) for the semester is: %s" % GPA(avg))

print("------*******-------")

report(avg,advisor)

print("------*******-------")

print("This complete the grade report for %s %s for this semester" %(studentID , name))