# get an item price
item_price = float(input("Enter an item price: "))

# if the item price is 0 or less print an error
if item_price <= 0:
	print ("Invalid price")

# otherwise it's valid
else:
	
	# < $10 gets no discount
	if item_price <= 10:
		print ("No discount, total price = ", item_price)
		
	# < $50, 10% discount
	elif item_price < 50:
		print("10% discount, total price = ", item_price - (0.1 * item_price) )
		
	# otherwise 20% discount
	else:
		print("20% discount, total price = ", item_price - (0.2 * item_price) )