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Dylan opened a credit card account with $625.00 of available credit. Now that he has made some purchases, Dylan's account only has $343.75 of available credit. What is the percentage decrease of the amount of available credit in Dylan's account?

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Plasmataco
Percent decrease is amount of decrease over original amount. Thus we get
(625-343.75)/625=0.45 or 45%
First you will do 

ORIGINAL NUMBER-NEW NUMBER 
$625.00 - $343.75 = $281.25

Then you will divide that number (also known as the decrease) by the original number
$281.25 divided by $625.00 = 0.45

Then you will multiply that decimal by 100 since you are looking for a PERCENT DECREASE
0.45 x 100 = 45%

So the percent decrease is 45%