document.write( "Question 52969: The electricity costs of a business decreased from $12,000 one year to $10,920 the next. What is the rate of decrease? McGraw Hill, Chapter 2, Exercise 6, Problem 52. No ISBN so sorry! Thankyou for your time!!!! \n" ); document.write( "

Algebra.Com's Answer #35330 by funmath(2933) $\"\"$ $\"About$

You can put this solution on YOUR website!
There is more than one way to do this. I don't have your book, so I'm just going to show you the easiest way I can think of.
\n" ); document.write( "100(new-original)/original=rate change in percentage:
\n" ); document.write( "Original=12000
\n" ); document.write( "New=10920
\n" ); document.write( " $\"100%2810920-12000%29%2F12000\"$
\n" ); document.write( " $\"100%28-1080%29%2F12000\"$
\n" ); document.write( " $\"-108000%2F12000\"$
\n" ); document.write( "-9%
\n" ); document.write( "The negative sign tells you that it is a rate decrease. Therefore the rate of decrease is 9%. \n" ); document.write( "

\n" );