According to the American Medical Association,
the percentage of potential employees testing positive for illegall drugs on the decline.
The function: \(\displaystyle \L P(t)\:=\:\frac{73t^{\frac{1}{3}}\,-\,28t^{\frac{2}{3}}}{t}\,\) models the percentage \(\displaystyle P(t)\)
\(\displaystyle \;\;\)of people applying for jobs who test positive \(\displaystyle t\) years after 1985.
What percentage of people applying for jobs tested positive for illegal drugs in 1993?