Don’t go in here. In addition to the information provided, this “cup” is the standard American measuring cup used in cooking and when the measuring cup is full it becomes a “single cup”. 8 pieces, liquid or dry. The mug is the mug and the mug is 8 ounces.
Regardless of whether it is a dry step like metal or plastic, the top is completely filled in and flattened by turning the extra part with sharp edges like the back of a standard table knife. With such a defect; or a volume of liquid, which is a clear glass or plastic cup marked with the red label on the side. It can be easily filled and readable by pouring the liquid until it reaches the place you want. When they are filled with this symbol, each is 1 cup.
Especially if the interviewer wants “1/4 cup per ounce”. It’s obviously not difficult as it has nothing to do with style, size, container type, or even content type.