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Prices are in a dictionary: keys are item names (strings), values are prices (floats), e.g. {"coffee": 3.5, "muffin": 2.0, "juice": 4.0}.
Repeatedly ask what item the customer wants until they type done. If the item is on the menu, add its price to a running total. If unknown, print Not on menu and do not add.
Print the final total with two decimal places (you can use round(total, 2)).
Skills: dict lookup, in, accumulation.