The industrial output value of a certain city's development zone at the end of 2006 was 2.5 billion yuan. In 2007, it increased by 12% compared with 2006. In 2008, the growth rate of industrial output value decreased by 4 percentage points compared with the same period of the previous year. What was the industrial output value of this development zone at the end of 2008? ．
某市开发区2006年底的工业产值是25亿元，2007年比2006年增加12%，2008年工业产值增长比上年同期降低了4个百分点，2008年底该开发区的工业产值是多少亿元．
<gadget id="calculator">12 / 100</gadget>
<output>3/25 = around 0.12</output>

<gadget id="calculator">1 + (3/25)</gadget>
<output>28/25 = around 1.12</output>

<gadget id="calculator">4 / 100</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">1 - (1/25)</gadget>
<output>24/25 = around 0.96</output>

<gadget id="calculator">25 * (28/25) * (24/25)</gadget>
<output>672/25 = around 26.88</output>

<result>672/25 = around 26.88</result>