Question 667182
this is the "natural", or base-e log,  

When

{{{e^y = x}}}

Then base e logarithm of {{{x}}} is

{{{ln(x) = log_e(x) = y}}}


 
The {{{e}}} constant or Euler's number is:

{{{e = 2.71828183}}}


{{{ln(200)=5.2983173665480366774532150308269049832777031116178012}}}


{{{ln(200)=5.3}}}............rounded to one decimal place


so, {{{2.71828183^5.2983173665480366774532150308269049832777031116178012=200.0000}}}