document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1115961>Question 1115961</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In 2007, 500 millions copies of CDs were sold. The average decrease of sales annually is 1%. What year will annual sales reach 1 million? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #730787 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=730787\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  In 2007, 500 millions copies of CDs were sold. The average decrease of sales annually is 1%. What year will annual sales reach 1 million? <BR>\n" );
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document.write( "Note:: If the decrease is 1%, the surviving rate is 99%.<BR>\n" );
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document.write( "Solve:: 500 million*(0.99)^x = 1 million<BR>\n" );
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document.write( "0.99^x = 1/500 million<BR>\n" );
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document.write( "x = log[1/500]/log[0.99] years<BR>\n" );
document.write( "x = 618.35<BR>\n" );
document.write( "Ans:: 2007+618.35 = 2625.35 which is in the year 2626<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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