Concept: The question tests on the application in Percentage
Solution:
% of rotten fruits = [Total Rotten Fruit / Total Fruit] * 100
Total Rotten = 25% of 8 + 50% of 12 + 20% of 5 = 2 + 6 + 1 = 9
Total Fruit = 8 + 12 + 5 = 25
Required % = (9/25) * 100 = 36%
Option B