document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=389609>Question 389609</A>: <I><SPAN STYLE=\"word-break: break-all;\">  The revenue from selling x units of a product is given by<BR>\n" );
document.write( "    y = -0.0002x2 + 20x. How many units must be sold in<BR>\n" );
document.write( "    order to have the greatest revenue? (Find the x-coordinate<BR>\n" );
document.write( "    of the vertex of the parabola.) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #276151 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=276151\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> assuming I read the given equation correctly as y = -0.0002x^2 +20x<BR>\n" );
document.write( "note that it is a parabola which turns downward because the coefficient of the x^2 term is negative and therefore has a maximum at the vertex\r<BR>\n" );
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document.write( "the x coordinate of the vertex = -b/2a<BR>\n" );
document.write( "from the given revenue equation,<BR>\n" );
document.write( "a = -.0002, b=20<BR>\n" );
document.write( "x =-b/2a = -20/(-.0002)*2=20/4*10^-4 =5*10^4 <BR>\n" );
document.write( "x = 50,000<BR>\n" );
document.write( " ans; 50,000 units must be sold in order to have the greatest revenue </SPAN>\n" );
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