document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1203039>Question 1203039</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A circular path has an external radius of 20 m and it is 1 m wide. Find the total cost of gravelling the path at N130 per m ^ 2 and fencing both sides of the path at N37.50 per metre . Give your answer to the nearest N100. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #838271 by </B><A HREF=/tutors/aboutme.mpl?userid=Theo><B>Theo(13342)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Theo><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=Theo><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=838271\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> external radius is 20m.<BR>\n" );
document.write( "internal radiu is 19m.<BR>\n" );
document.write( "area of 20m circle is pi * 20^2 = 400 * pi<BR>\n" );
document.write( "area of 19m circle is pi * 19^2 = 361* pi<BR>\n" );
document.write( "area of the path is 400 - 361 = 39 * pi<BR>\n" );
document.write( "cost of graveling is N130 * 39 * pi = N15927.87475 = N15900.<BR>\n" );
document.write( "circumference of 20m circle is 2 * pi * 20 = 40 * pi.<BR>\n" );
document.write( "circumference of 19m circle is 2 * pi * 19 = 38 * pi.<BR>\n" );
document.write( "cost of fencing is N37.50 * (40 * pi + 38 * pi) = 37.50 * 78 * pi = N9189.158512 = N9200. </SPAN>\n" );
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