blackrock information related to our equity investment in blackrock follows: .

2009: business segment earnings ( in millions ) ( a ): 207
pnc 2019s share of blackrock earnings ( b ): -23
carrying value of pnc 2019s investment in blackrock ( in billions ) ( b ): 5.8
2008: business segment earnings ( in millions ) ( a ): 207
pnc 2019s share of blackrock earnings ( b ): -33
carrying value of pnc 2019s investment in blackrock ( in billions ) ( b ): 4.2

carrying value of pnc 2019s investment in blackrock ( in billions ) ( b ) $ 5.8 $ 4.2 ( a ) includes pnc 2019s share of blackrock 2019s reported gaap earnings and additional income taxes on those earnings incurred by pnc . ( b ) at december 31 . blackrock/barclays global investors transaction on december 1 , 2009 , blackrock acquired bgi from barclays bank plc in exchange for approximately $ 6.65 billion in cash and 37566771 shares of blackrock common and participating preferred stock . in connection with the bgi transaction , blackrock entered into amendments to stockholder agreements with pnc and its other major shareholder . these amendments , which changed certain shareholder rights , including composition of the blackrock board of directors and share transfer restrictions , became effective upon closing of the bgi transaction . also in connection with the bgi transaction , blackrock entered into a stock purchase agreement with pnc in which we purchased 3556188 shares of blackrock 2019s series d preferred stock at a price of $ 140.60 per share , or $ 500 million , to partially finance the transaction . on january 31 , 2010 , the series d preferred stock was converted to series b preferred stock . upon closing of the bgi transaction , the carrying value of our investment in blackrock increased significantly , reflecting our portion of the increase in blackrock 2019s equity resulting from the value of blackrock shares issued in connection with their acquisition of bgi . pnc recognized this increase in value as a $ 1.076 billion pretax gain in the fourth quarter of 2009 . at december 31 , 2009 , our percentage ownership of blackrock common stock was approximately 35% ( 35 % ) . blackrock ltip programs and exchange agreements pnc 2019s noninterest income included pretax gains of $ 98 million in 2009 and $ 243 million in 2008 related to our blackrock ltip shares obligation . these gains represented the mark-to-market adjustment related to our remaining blackrock ltip common shares obligation and resulted from the decrease in the market value of blackrock common shares in those periods . as previously reported , pnc entered into an exchange agreement with blackrock on december 26 , 2008 . the transactions that resulted from this agreement restructured pnc 2019s ownership of blackrock equity without altering , to any meaningful extent , pnc 2019s economic interest in blackrock . pnc continues to be subject to the limitations on its voting rights in its existing agreements with blackrock . also on december 26 , 2008 , blackrock entered into an exchange agreement with merrill lynch in anticipation of the consummation of the merger of bank of america corporation and merrill lynch that occurred on january 1 , 2009 . the pnc and merrill lynch exchange agreements restructured pnc 2019s and merrill lynch 2019s respective ownership of blackrock common and preferred equity . the exchange contemplated by these agreements was completed on february 27 , 2009 . on that date , pnc 2019s obligation to deliver blackrock common shares was replaced with an obligation to deliver shares of blackrock 2019s new series c preferred stock . pnc acquired 2.9 million shares of series c preferred stock from blackrock in exchange for common shares on that same date . pnc accounts for these preferred shares at fair value , which offsets the impact of marking-to-market the obligation to deliver these shares to blackrock as we aligned the fair value marks on this asset and liability . the fair value of the blackrock series c preferred stock is included on our consolidated balance sheet in other assets . additional information regarding the valuation of the blackrock series c preferred stock is included in note 8 fair value in the notes to consolidated financial statements included in item 8 of this report . pnc accounts for its remaining investment in blackrock under the equity method of accounting , with its share of blackrock 2019s earnings reduced primarily due to the exchange of blackrock common stock for blackrock series c preferred stock . the series c preferred stock is not taken into consideration in determining pnc 2019s share of blackrock earnings under the equity method . pnc 2019s percentage ownership of blackrock common stock increased as a result of the substantial exchange of merrill lynch 2019s blackrock common stock for blackrock preferred stock . as a result of the blackrock preferred stock held by merrill lynch and the new blackrock preferred stock issued to merrill lynch and pnc under the exchange agreements , pnc 2019s share of blackrock common stock is higher than its overall share of blackrock 2019s equity and earnings . the transactions related to the exchange agreements do not affect our right to receive dividends declared by blackrock. .

Questions:
what is the carrying value of pnc 2019s investment in blackrock in 2009?
what about in 2008?
what is the sum for two years?

Answers:
5.8
4.2
10