pizza order system
pizza quantity
maximum 6 pizzas
minimum 1 pizza
pizza sizes
medium
large
small
price = £7.25
price = £9.50
price = £11.15
extra toppings
2
3
1
4+
0
+0 price
+£1 price
+£1.75 price
+£2.50 price
+£3 price
if total price is more than £20
price *= 0.9
is delivery needed?
yes
ultimate price = price +£6