Rounding error in prior day's Nasdaq-100 close
2/21/18. Yahoo says today the prior day's close of the Nasdaq-100 was 6,779.6948. Normal rounding rules are that the gain has to be greater than .50 to round up. Your historical prices page and my portfolio page (https://finance.yahoo.com/portfolio/pf_10/view/view_2) put the prior day's close at 6,779.70. It should be 6,779.69.
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