The correct option is C 6.4
Here, each small boxes represents 110 th.
So a complete column of shaded boxes will represent 1.
Similarly 6 completely shaded column represent 6.
Since each single box represent 110, 4 colored box will be,
4×110=410
i.e., 0.4
So the decimal number represented here is 6 and 0.4. That is, 6.4