document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=47587>Question 47587</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0072549017/algebrahomeworkh>Beginning Algebra</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> Need help solving these kind of problems.  Once I am shown how to work this type, I will be able to work the rest.\r<BR>\n" );
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document.write( "The electricity costs of a business decreased from $12,000 one year to $10,920 the next. What is the rate of decrease?\r<BR>\n" );
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document.write( " Can someone show me how to set up the problem to get the solution.\r<BR>\n" );
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document.write( "Thank You\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #31421 by </B><A HREF=/tutors/aboutme.mpl?userid=Nate><B>Nate(3500)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Nate><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=31421\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The time it took to decrease the electricity cost is one year.<BR>\n" );
document.write( "(12000,0) and (10920,1)<BR>\n" );
document.write( "Now, find slope:<BR>\n" );
document.write( "M = (y2 - y1)/(x2 - x1) = (12000 - 10920)/(0 - 1) = -1080<BR>\n" );
document.write( "1080/12000 = 0.09 = 9%<BR>\n" );
document.write( "The Rate of Decrease: 9%<BR>\n" );
document.write( "Check: 9% of 12000 is 1080 .... 12000 - 1080 = 10920 </SPAN>\n" );
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