It is the performance distribution of 30 enterprises, and it is difficult to understand without a contact map.

So the area of all rectangular columns adds up to 30.

Look at [10, 18]. What's the total of the two columns?

The sum of all heights (0.017+0.025+0.033+0.075+0.1) = 0.25.

(10, 18), the =0.025+0.075=0. 1 of the two pillars.

(0. 1/0.25)*30= 12

Option d

Hope to adopt