what was the percentage change in total operating expenses between 2008 and 2009?
corporate/other corporate/other includes global staff functions ( includes finance , risk , human resources , legal and compliance ) and other corporate expense , global operations and technology ( o&t ) , residual corporate treasury and corporate items . at december 31 , 2009 , this segment had approximately $ 230 billion of assets , consisting primarily of the company 2019s liquidity portfolio , including $ 110 billion of cash and cash equivalents. .

| In millions of dollars | 2009 | 2008 | 2007 |
| :--- | :--- | :--- | :--- |
| Net interest revenue | $(1,663) | $(2,680) | $(2,008) |
| Non-interest revenue | (8,893) | 422 | (302) |
| Total revenues, net of interest expense | $(10,556) | $(2,258) | $(2,310) |
| Total operating expenses | $1,420 | $510 | $1,813 |
| Provisions for loan losses and for benefits and claims | (1) | 1 | (3) |
| (Loss) from continuing operations before taxes | $(11,975) | $(2,769) | $(4,120) |
| Income taxes (benefits) | (4,369) | (587) | (1,446) |
| (Loss) from continuing operations | $(7,606) | $(2,182) | $(2,674) |
| Income (loss) from discontinued operations, net of taxes | (445) | 4,002 | 708 |
| Net income (loss) before attribution of noncontrolling interests | $(8,051) | $1,820 | $(1,966) |
| Net income attributable to noncontrolling interests | — | — | 2 |
| Net income (loss) | $(8,051) | $1,820 | $(1,968) |

2009 vs . 2008 revenues , net of interest expense declined , primarily due to the pretax loss on debt extinguishment related to the repayment of the $ 20 billion of tarp trust preferred securities and the pretax loss in connection with the exit from the loss-sharing agreement with the u.s . government . revenues also declined , due to the absence of the 2008 sale of citigroup global services limited recorded in o&t . this was partially offset by a pretax gain related to the exchange offers , revenues and higher intersegment eliminations . operating expenses increased , primarily due to intersegment eliminations and increases in compensation , partially offset by lower repositioning reserves . 2008 vs . 2007 revenues , net of interest expense increased primarily due to the gain in 2007 on the sale of certain corporate-owned assets and higher intersegment eliminations , partially offset by improved treasury hedging activities . operating expenses declined , primarily due to lower restructuring charges in 2008 as well as reductions in incentive compensation and benefits expense. .

total_operating_expenses_2008 = 1420
total_operating_expenses_2007 = 510
change = total_operating_expenses_2008 - total_operating_expenses_2007
percent_change = change / total_operating_expenses_2007
answer = percent_change * 100