Question

What percentage is 36,000 of 80,000?

Answer 1

[1] When asked an easy question like "What percentage is 10 of 20?" we can easily find the answer by writing:
10/20 = 0.5 => 50%

[2] The same idea works even for big numbers:
36000/80000 = 0.45 => 45%

Answer 2

45 percent because you take 36000 times 100 and divide it by 80000