Receipt lines

order maps item names to (quantity, price) tuples. Write receipt(order) that returns one line per item, alphabetical by item, in the form <item> x <quantity> = <total>.

receipt({"milk": (2, 2.5), "bread": (3, 25)})  ->  ["bread x 3 = 75", "milk x 2 = 5.0"]

def receipt(order):
    ...