We have that 1 billion people = 1.000'000.000
Then we first calulate how much is 0.386 billion:
So we have:
386000000
So the total were:
1386000000, now:
If 1386000000 represents 100% of the population, then what percentage of the population does 11080000 represent:
then we have:
Wuhan had aprox the 0.8% of the total population of china on 2018.