What was the change in opening price compared to the previous closing price (in dollars, unadjusted) on the effective date of Apple Inc.'s (AAPL) most recent stock split? What was the split ratio? (Round to two decimal places)

```reference [{"type":"table-json","id":5}] ``` Summary The table shows that on Apple’s most recent stock-split effective date, 2020-08-31, the shares opened at $127.58 versus a prior close of $124.81, an unadjusted increase of $2.77. The split that took effect that day was 4-for-1. The opening and previous-close prices come from the internal price history , while the split ratio is confirmed by contemporaneous market reports .