document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1155801>Question 1155801</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A company sells a phone for 120$ each for 10 or less. For each phone in excess of 10, the price is decreased 4$ per phone for everyone. What number of phone will produce the greatest revenue for the company? </SPAN>\n" );
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document.write( "that would be 116<BR>\n" );
document.write( "for x=2 that would be 112<BR>\n" );
document.write( "so revenue would be (10+x)(120-4x)<BR>\n" );
document.write( "that is 1200+80x-4x^2 and has to be maximized<BR>\n" );
document.write( "with x=-b/2a for the vertex, x is -80/-8=10<BR>\n" );
document.write( "20 phones is the greatest revenue with 20*(120-40)=$1600<BR>\n" );
document.write( "19 wold be 19*84=$1596<BR>\n" );
document.write( "and 21 would be 21*76, also $1596 </SPAN>\n" );
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