Question 116572
{{{P=12 +50 ln x=90}}} 
{{{50 ln x=90-12}}} 
{{{50 ln x=78}}} 
{{{ln x=1.56}}}
{{{x=e^(1.56)}}}
{{{x=4.76}}}
That's approximately 4 years 9 months
From 2001, the year would be 2005.