How do you calculate SP500 ?

M

maxima120

1. I have 500 symbols (supposedly are constituents of the SP500 cash index).

2. I have %% weight of each in the SP500 (questionable quality data though but is close if you weigh them by Market Cap).

3. I calculate Sum(Last x Weight) and I get $120 instead of $180

what am I doing wrong?
 
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