document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1122512>Question 1122512</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Roberto Invested a total of $10,000 apart at 6% in part and 9% how much did you invest in the lower interest account if the total interest earned in one year was $810? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #738661 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13209)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=738661\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "Here is a really fast way to solve this kind of problem, without algebra.<br><BR>\n" );
document.write( "(Of course, if a solution using algebra is required, this method won't do....)<br><BR>\n" );
document.write( "(1) $810 return on a $10,000 investment is 8.1%.<BR>\n" );
document.write( "(2) 8.1% is 7/10 of the way from 6% to 9%.  (Plot the numbers on a number line if you need help seeing this).<BR>\n" );
document.write( "(3) Therefore 7/10 of the $10,000 must be invested at the higher rate.<br><BR>\n" );
document.write( "Answer: $7000 at 9%; so $3000 at 6%. </SPAN>\n" );
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