Solve this differential equation:

dydt=0.04y(1000y)\displaystyle \frac{{{\left.{d}{y}\right.}}}{{{\left.{d}{t}\right.}}}={0.04}{y}{\left({1000}-{y}\right)}
y(0)=5\displaystyle {y}{\left({0}\right)}={5}

y(t) =