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Barnes & Soars on Parent's Buyout Offer

Barnes & Noble offers to buy the 25% it doesn't already own for $2.50 a share.

Shares in

Barnes &


soared in very heavy trading Friday after

Barnes & Noble

(BKS) - Get Barnes & Noble, Inc. Report

, the nation's largest bookseller, offered to acquire the 25% of its dot-com spinoff that it doesn't already own.

Shares in Barnes & were up 57 cents, or 25%, to $2.82. More than 22 million shares had changed hands -- about 80 times normal daily trading volume.

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Barnes & Noble is offering $2.50 a share in cash for each Barnes & share.

Barnes & Noble valued the offer at $115 million, but on the basis of the number of outstanding shares, the price tag works out to about $102 million.

In September, Barnes & Noble purchased German-based

Bertelsmann AG's

37% stake in the dot-com company for $164 million, or $2.80 a share, raising its own stake to 75%.

With Barnes & shares trading near that level rather than the offer price, investors appeared to be expecting -- anticipating -- a sweetened bid.

Barnes & Nobles shares were up 28 cents, or 0.9%, at $30.65, a 52-week high. It launched the Web-based company during the height of the Internet boom in an effort to fend off