To solve this problem, we can use the proportion:
[tex] \frac{part}{whole} = \frac{percent}{100} [/tex]
Here, the part is 9, the percent is 2, and let's call the whole x. Now we can solve. This proportion becomes:
[tex] \frac{9}{x} = \frac{2}{100} [/tex]
Now we can cross-multiply.
900 = 2x
x = 450
That means that 9 is 2% of 450.
