document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=863782>Question 863782</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The output of a particular producing oil well decreases at the continuous rate of 12% per year. How long it will take for the output to fall to 1/5 of its present output? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #520597 by </B><A HREF=/tutors/aboutme.mpl?userid=ewatrrr><B>ewatrrr(24785)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ewatrrr><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=ewatrrr><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=520597\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=O%28t%29+=+O%5B0%5De%5E%28-rt+%29++ ALIGN=MIDDLE  ALT=\"O%28t%29+=+O%5B0%5De%5E%28-rt+%29++\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "ln(.2)/-.12 = t = 13.412 years </SPAN>\n" );
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