algebra
posted by 1215 .
A college student is looking at her monthly checking account records. On September 1, 2008, her checking account held a balance of $1,050. At the end of March 2009, her checking account held a balance of $800. What is the monthly rate of change for the studentâ€™s checking account over the period September 1, 2008 through March 31, 2009?

(1050  800) / 7 = $35.71 decrease per month
100 (35.71 / 1050) = ______% decrease
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