If 20% of a number is 50, then what is that number?

Given:

20% of a number is 50. 
Let the number be $$x.$$​​
​$$20\% \text{ of } x = 50 \\[4pt]\Rightarrow \frac{20}{100}x = 50 \\[4pt]\Rightarrow \frac{x}{5} = 50 \\[4pt]\Rightarrow x = 50 \times 5 = 250 \\[6pt]$$​​
Therefore, the correct option is (c) 250.