document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=388343>Question 388343</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A bookstore reduced the price of a book with 25%. after that the sale rose by 10%.<BR>\n" );
document.write( "With how many percent rose the number of sold books? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #274733 by </B><A HREF=/tutors/aboutme.mpl?userid=robertb><B>robertb(5830)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=robertb><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=robertb><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=274733\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> let p = unit price of book , q = number of books sold.<BR>\n" );
document.write( "sales before was pq.  Under the new unit price 0.75p, <BR>\n" );
document.write( "the new sales is 1.10pq.  We have to solve for x in 1.10pq = 0.75p(q+x).<BR>\n" );
document.write( "1.10pq = 0.75pq + 0.75px, or<BR>\n" );
document.write( "0.35pq = 0.75px, or <BR>\n" );
document.write( "0.35q = 0.75x, or x = 0.35q/0.75 = 7q/15, the increase in the quantity of books sold, corresponding to a 7*100/15% = 46.67% increase from the previous. </SPAN>\n" );
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