document.write( "Question 875457: I have a 72 our final is worth 10 percent if our grade, what do I have to get on the final to get it up to an 80? \n" ); document.write( "
Algebra.Com's Answer #528202 by Edwin McCravy(20060)\"\" \"About 
You can put this solution on YOUR website!
I have a 72 our final is worth 10 percent if our grade, what do I have to get on the final to get it up to an 80?
\n" ); document.write( "
\r\n" );
document.write( "It's impossible, because 72 counts 90% of your grade!  \r\n" );
document.write( "Here's how you would figure it if it were possible:\r\n" );
document.write( "\r\n" );
document.write( "(90% of 72) + (10% of x) = 80\r\n" );
document.write( "\r\n" );
document.write( "        0.90(72) + 0.10x = 80\r\n" );
document.write( "            64.8 + 0.10x = 80    <--subtract 64.8 from both sides\r\n" );
document.write( "                   0.10x = 15.2\r\n" );
document.write( "                       x = \"15.2%2F0.10\"\r\n" );
document.write( "                       x = 152\r\n" );
document.write( "\r\n" );
document.write( "You can't make more than 100, so it can't be done.\r\n" );
document.write( "\r\n" );
document.write( "Edwin
\n" ); document.write( "
\n" );