I'm not good at math. Ask a simple math problem, no kidding.

Your question should be: the oil consumption per year100000 tons is still not in line with the actual situation. The answer is as follows:

40 million people = 40 million people (plus four zeros), 1000 ton = 1000000 kg (plus three zeros) = 2000000 kg (multiplied by 2), 2000000-4000000 = 0.05 kg.

A: An average person uses 0.05 Jin of cooking oil every year.

0.05×90000000=4500000 kg =2250000 kg (divided by 2)=2250 tons (three zeros removed)

A: 90 million people use 2250 tons of oil every year.