document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=898882>Question 898882</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Electricity Generated by Windmills:<BR>\n" );
document.write( "One growing community in California currently uses 2 megawatts (MW) of electricity per year. All this electricity is generated from coal. The community plans to add x MW of windmill generation capacity to its system to meet increasing demand. How many megawatts of windmill generation capacity must be built in order that 20% of the community's total electricity usage comes from windmills?\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "I know the answer is supposed to be .5mw but I am stumped as to what formula to use to get that answer. \r<BR>\n" );
document.write( "\n" );
document.write( "If I turn it into a sentence, I'd say \"What is 20% of 2 MW?\" That will give me a 0.4 answer though, which doesn't fit the correct answer. :( </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #545025 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=545025\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Present megawatt usage: 2 MW\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Future megawatt usage: 2+x (we're adding on x megawatts)\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "-------------------------------------------------------\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "So we go from 2 to 2+x. The x megawatts added are coming from windmills and windmills alone (given in the instructions). \r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "So that means we have...\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "(MW of windmills only)/(total megawatt usage) = percentage of windmill MW output\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "( x )/( 2 + x ) = 20%\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "( x )/( 2 + x ) = 20/100\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "( x )/( 2 + x ) = 0.20\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "x = 0.20( 2 + x )\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "x = 0.20(2) + 0.20(x)\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "x = 0.40 + 0.20x\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "x + 0.20x = 0.40\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "0.80x = 0.40\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "x = 0.40/0.80\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "x = 0.50\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "So you need to add 0.50 MW from windmills alone to get to 2+0.5=2.5 MW total\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Notice how: 0.5/2.5 = 0.2 = 20%. So 20% of the energy is produced by windmills. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );