"Tôi dùng hai đô la để mua một cái bánh."

Yes. You can see the hint.

bánh is any sweet, salty, or savory food prepared from flour (especially rice flour) or pressed grains (such as glutinous rice) and cooked by steaming, baking, frying, deep-frying, or boiling: a pastry, cake, bread, dumpling, noodle, wafer, or pudding.