How to Pronounce You-O in French

The word for 30, 30 is throun. You could say, for example, you-o, 30 euros. How might that sound in French? Er-o. Because we don't pronounce the last S, either. So d'wa, although literally meaning o, we will use much more like have to must. What was the d'wa in French, like portu? La portu.