How can I find adj close and open for a stock using calculating? (I have dividends and stock split)

For example Almarai Company (this information from yahoo finance website).

You can use any price as an example

Date Open High Low Close Adj Close** Dec 01, 2019 49.25 51.10 48.00 49.50 48.63 Nov 01, 2019 49.00 52.20 48.80 49.25 48.39 Oct 01, 2019 49.90 50.80 45.55 49.90 49.03 Sep 01, 2019 49.60 51.50 47.85 49.75 48.88 Aug 01, 2019 50.80 52.10 49.15 49.55 48.68 Jul 01, 2019 53.80 53.80 49.75 50.60 49.71 Jun 01, 2019 51.00 56.50 50.50 53.50 52.56 May 01, 2019 60.00 60.30 49.70 51.00 50.11 Apr 08, 2019 0.85 Dividend Apr 01, 2019 55.00 61.00 54.60 60.10 58.15 Mar 01, 2019 53.90 55.50 52.30 55.10 53.31