Method 1:
[tex]\begin{array}{ccc}100\%&-&x\\0.5\%&-&8\end{array}\qquad\text{cross multiply}\\\\0.5x=(100)(8)\\\\0.5x=800\qquad\text{multiply both sides by 2}\\\\\boxed{x=1,600}\\\\Answer:\ \text{8 is 0.5}\%\ \text{of 1,600.}[/tex]
Method 2:
[tex]p\%=\dfrac{p}{100}\\\\0.5\%=\dfrac{0.5}{100}=\dfrac{5}{1,000}\\\\n-a\ number\\\\0.5\%\ of\ n\ is\ 8\\\\\dfrac{5}{1,000}x=8\\\\\dfrac{1}{200}x=8\qquad\text{multiply both sides by 200}\\\\\boxed{x=1,600}[/tex]
Method 3:
[tex]5\%=0.005\\\\8:0.005=8,000:5=\boxed{1,600}[/tex]
