Question 68542
What is asked in the problem?
What is the rate of decrease?
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Given:
 Electricity cost of a business decreased from $12,000 to $10,920.
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Find the decrease of cost  
$12,000 - $10,920 = $1, 080
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$1,080 is what percent of $12,000
1,080 = 12,000x
<br>{{{(1080/12000) = (12000x/12000)}}}
<br>0.09 = x
or
9%