calculate the market-weight index showing formulas and explain the impact.

if there is something missing which makes it difficult to calculate please let me know.

DO GR LOW SPW Index Explain Impact of DUK & GR BAC 8.05 8.06 28.62 27.62 NUE 37.87 38.90 DUK 23.28 68.69 FDO 67.95 67.28 SAH 14.05 14.71 64.95 65.85 UFS 76.95 78.74 Monday, July 2, 2012 127.00 Tuesday, July 3, 2012 127.01 Wednesday, July 4, 2012 Thursday, July 5, 2012 127.11 Friday, July 6, 2012 127.12 27.58 38.86 7.82 7.66 68.57 66.23 68.23 69.58 38 35 14.97 14.86 66.07 64.36 27.85 78.25 78.25