SAT Question dccdb20c: Percentages answer and explanation with Desmos solution

It's given that $6\%$ of the $450$ tiles in a box are black. Therefore, the number of black tiles in the box can be calculated by multiplying the number of tiles in the box by $\frac{6}{100}$, which is equivalent to $450\left(\frac{6}{100}\right)$, or $27$.