Final answer:
To find the percentage of total votes candidate B received from the middle class, the provided numbers for each socio-economic class need to be added and the middle class votes then calculated as a percentage of this total, which is 30%.
Step-by-step explanation:
The question asks what percentage of the total represents those who voted for candidate B in the socio-economic middle class. To answer this, we must refer to the data provided.
If we assume that the numbers 60, 36, 24 represent the distribution of voters for candidate B among high, middle, and low socio-economic classes respectively, then the total number of voters for B is 60 + 36 + 24 = 120. The middle class voters represent 36 out of this 120. To find the percent vote for B in the middle class, we calculate (36/120) × 100%, which gives us 30%. Hence, 30% of those who voted for B belong to the middle class.