GPA converter (Flask/Python)

from flask import Flask, render_template, request

app = Flask(__name__)

#serve up the main page  (index)
@app.route("/")

def index():
    return render_template("index.html")

#process form submit data and give results HTML page
@app.route("/convert")

def convert():

    #get info from the submitted form
    fname = request.args['firstname']
    lname = request.args['lastname']
    dollars = request.args['dollars']
    cents = request.args['cents']
    history = request.args['history']
    math = request.args['math']
    english = request.args['english']
    science = request.args['science']
    lang = request.args['lang']

    #do the conversion calc (100 -> 4.0)
    avg = (int(history) + int(math) + int(english) + int(science) + int(lang)) / 5

    if avg > 97:
        gpa = 4.3
    elif avg > 93:
        gpa = 4.0
    elif avg > 90:
        gpa = 3.7
    elif avg > 87:
        gpa = 3.3
    else:
        gpa = 2.0

    #build the results HTML page
    return "Your GPA is " + str(gpa)