Answer:
20%
Explanation:
You want to find what percent of 400,000 is 80,000.
Equation
The given relation can be expressed as ...
what% × 400,000 = 80,000
Solution
Using the equivalence of % and /100, this can be written ...
what/100 × 400,000 = 80,000
Simplifying, this is ...
what × 4,000 = 80,000
Dividing by the coefficient of the variable gives ...
what = 80,000/4,000 = 80/4 = 20
Then your answer is ...
what% = 20%
The missing number is 20%.
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Additional comment
Effectively, you're expressing the fraction 80,000/400,000 as a percentage:
80,000/400,000 × 100% = 20%
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