2/3 is what percent of 1/3 ?

Suppose that $\frac{2}{3}$ is $x$ percent of $\frac{1}{3}$

It implies that $\frac{x}{100}\left(\frac{1}{3}\right)=\frac{2}{3}$

Cancel out the common term 3 from both sides and then cross multiply

$x=200$

Therefore, $\frac{2}{3}$ is $\boxed{\mathbf{200}}$ percent of $\frac{1}{3}$