Bitcoin jumps 13%, still down sharply for the week

Bitcoin surged about 13 percent on Friday, but was still on track for a big weekly loss during a tumultuous period of trading.

The cryptocurrency fell as low as $2,951.15 Friday, its lowest level since early August, before rebounding to $3,641.47 in late afternoon trading. For the week, however, bitcoin has lost about 14.7 percent of its value.

Bitcoin this week

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