(Reuters) – British fund manager Jupiter said on Friday it is planning to scrap about a quarter of its product range as the struggling investment house restructures its operations. The group is closing, merging or repositioning about a third of its funds, but said only 4% of its managed assets have been impacted. “We have undergone a process to rationalise our fund range, to reduce complexity and to make sure that we’re focused on what we’re good at,” a Jupiter spokesperson said in a statement. The Financial Times earlier on Friday reported that the value of funds under management affected by …