for 2000 , what is the implied revenue for the north america segment based on the margin , in millions ? \\n
the breakdown of aes 2019s gross margin for the years ended december 31 , 2000 and 1999 , based on the geographic region in which they were earned , is set forth below. .

|  | 2000 | % of Revenue | 1999 | % of Revenue | % change |
| :--- | :--- | :--- | :--- | :--- | :--- |
| North America | $844 million | 25% | $649 million | 32% | 30% |
| South America | $416 million | 36% | $232 million | 28% | 79% |
| Caribbean* | $226 million | 21% | $75 million | 24% | 201% |
| Europe/Africa | $371 million | 29% | $124 million | 29% | 199% |
| Asia | $138 million | 22% | $183 million | 37% | (26%) |

* includes venezuela and colombia . selling , general and administrative expenses selling , general and administrative expenses increased $ 11 million , or 15% ( 15 % ) , to $ 82 million in 2000 from $ 71 million in 1999 . selling , general and administrative expenses as a percentage of revenues remained constant at 1% ( 1 % ) in both 2000 and 1999 . the increase is due to an increase in business development activities . interest expense , net net interest expense increased $ 506 million , or 80% ( 80 % ) , to $ 1.1 billion in 2000 from $ 632 million in 1999 . interest expense as a percentage of revenues remained constant at 15% ( 15 % ) in both 2000 and 1999 . interest expense increased primarily due to the interest at new businesses , including drax , tiete , cilcorp and edc , as well as additional corporate interest costs resulting from the senior debt and convertible securities issued within the past two years . other income , net other income increased $ 16 million , or 107% ( 107 % ) , to $ 31 million in 2000 from $ 15 million in 1999 . other income includes foreign currency transaction gains and losses as well as other non-operating income . the increase in other income is due primarily to a favorable legal judgment and the sale of development projects . severance and transaction costs during the fourth quarter of 2000 , the company incurred approximately $ 79 million of transaction and contractual severance costs related to the acquisition of ipalco . gain on sale of assets during 2000 , ipalco sold certain assets ( 2018 2018thermal assets 2019 2019 ) for approximately $ 162 million . the transaction resulted in a gain to the company of approximately $ 31 million . of the net proceeds , $ 88 million was used to retire debt specifically assignable to the thermal assets . during 1999 , the company recorded a $ 29 million gain ( before extraordinary loss ) from the buyout of its long-term power sales agreement at placerita . the company received gross proceeds of $ 110 million which were offset by transaction related costs of $ 19 million and an impairment loss of $ 62 million to reduce the carrying value of the electric generation assets to their estimated fair value after termination of the contract . the estimated fair value was determined by an independent appraisal . concurrent with the buyout of the power sales agreement , the company repaid the related non-recourse debt prior to its scheduled maturity and recorded an extraordinary loss of $ 11 million , net of income taxes. .

gross_margin = 844
revenue = 0.25
percent_gross_margin = gross_margin / revenue
answer = percent_gross_margin