# Chapter 3 - Introduction to Graphing - 3.4 Rates - 3.4 Exercise Set - Page 185: 15

$\$1, 285.8$billion per year #### Work Step by Step To find the average rate of increase, solve for the increase in budget debt then divide it by the time in years. Increase in Debt =$\$(15,041-8,612) =\$6,429$billion Time =$2011 - 2006=5$years Divide the increase in budget by the number of years to obtain: Average Annual Increase in Debt =$\dfrac{6429\text{ billion dollars}}{5\text{ years}}= 1,285.8\$ billion dollars per year

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