document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1140883>Question 1140883</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 12. A tool rental company determines that it will rent 500 jackhammers per day at a daily rental fee of $30 per jackhammer. For each $1 increase in rental price, 10 fewer jackhammers will be rented. What rental price maximizes revenue?  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #761395 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=761395\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> the revenue function is (500-10x)(30+x)=15000-300x+500x-10x^2<BR>\n" );
document.write( "=-10x^2+200x-15000 <BR>\n" );
document.write( "this has a maximum at x=-b/2a=-200/-20 or 10<BR>\n" );
document.write( "when the price is $40, the number is 400, and the revenue is $16,000<BR>\n" );
document.write( "check with $41 and 390 ($15,990) and 39 and 410 (same)\r<BR>\n" );
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