document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=231918>Question 231918</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Robert invests $8000 in a bank. Part is invested at 7% simple interest and part at 9% simple interest. In one year Robert earns $660 in interest. How much did he invest at each amount? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #171521 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley77><B>checkley77(12844)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley77><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=171521\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> .09X+.07(8,000-X)=660<BR>\n" );
document.write( ".09X+560-.07X=660<BR>\n" );
document.write( ".02X=660-560<BR>\n" );
document.write( ".02X=100<BR>\n" );
document.write( "X=100/.02<BR>\n" );
document.write( "X=5,000 AMOUNT INVESTED @ 9%.<BR>\n" );
document.write( "8,000-5,000=3,000 AMOUNT INVESTED @ 7%.<BR>\n" );
document.write( "PROOF:<BR>\n" );
document.write( ".09*5,000+.07*3,000=660<BR>\n" );
document.write( "450+210=660<BR>\n" );
document.write( "660=660 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );