Python: Ice Cream Selector

from guizero import App, Text, Slider, CheckBox, TextBox, PushButton, Combo

def doCalc():
    tb_name.text_color = "red"
    total=0
    scoops=int(sl_scoops.value)
    if(cb_flavour.value=="Vanilla"):
        icecream=50
    else:
        icecream=60
    if (cb_sauce.value=="None"):
        sauce=0
    else:
        sauce=20
    if (cb_extras.value=="None"):
        extras=0
    elif(cb_extras.value=="Flake"):
         extras=30
    elif(cb_extras.value=="Chopped Nuts"):
        extras=20
    elif(cb_extras.value=="Sprinkles"):
        extras=10
    total = float(scoops*icecream+sauce+extras)/100
    tx_total.value="£"+str(total)+"0"
    tx_total.size=24
    tx_total.show()


app = App(title='Ice Cream App', bg="white", width=240, height=480)
app.text_color="blue"
tx_title = Text(app, text="Choose Your Ice Cream", size=14)
tx_title.text_color = "black"
tx_underline = Text(app, text="------------------------" , size=18)
tx_underline.text_color = "white"
tx_underline.bg = "black"
tx_name = Text(app, text="Give Your Ice Cream a Name:")
tx_name.text_color = "blue"
tb_name = TextBox(app,text="Crunchy Slime", width =20)
tx_scoops = Text(app, text="How Many Scoops:")
tx_scoops.text_color = "blue"
sl_scoops=Slider(app,start=1,end=4,horizontal=True)
tx_flavour=Text(app, text="Ice Cream Flavour")
tx_flavour.text_color = "blue"
cb_flavour=Combo(app,options=["Vanilla","Chocolate","Strawberry"])
tx_sauce=Text(app,text="Sauce:")
tx_sauce.text_color = "blue"
cb_sauce=Combo(app,options=["None","Chocolate","Monkey Blood","Alien Juice"],selected="None")
tx_extras=Text(app,text="Extras:")
tx_extras.text_color = "blue"
cb_extras=Combo(app,options=["None","Flake","Chopped Nuts","Sprinkles"],selected="None")
bt_calc = PushButton(app, command = doCalc, text='Calculate Price')
tx_total = Text(app, text="price goes here")
tx_total.hide()
app.display()