how do i calculate the stock returns?

Sheet1 EN TWIT INTER MEM HENRI et ST WW ed MIN WWW HIM ME OF THE SALA w WER BE WER . 20 2018 2015- 2018 2010 O LE VIK 2001 11.00 2012.01.01 2012-01-01 2010 TO 144 9 7 4 1 1 4 20 21 FOTOS sen MITOL TORS 1 10 21 NET WODOWY WERS TE DE E DE NH HD TOT HORE WWW TOON Www To 10 WHO WE WWE NICE TO TPE TWW W 1990 WE KETE ASLE - wat SERI HON 2 WEER THEm v 14 4 WOLNE WE NOW WE WE WE WRITE OS METRE DETE WA WILL NECTOR TOW WE TEK RT BEME WWWWW WERTY TER SET SET WHOLTSSWR mes to LINUT 190E WIR WEBS SU TOTO EN WWW SHWE WELT THE WERSA O EU EN 100M We SWNTOS WWW WEWE MCHETTEPE WE WERE WE HOTEL OR RO 10 ORO 100* IDONE 2 SM 16 Gel 2016.CIC. 2160 160 - 2.1 2015- 2015-11-02 WA Dele PS 2015 L 1 . . De MP 12 MIN EN NE Th R4 HOW THE 43 BER w MAWO 21 UPEN DEE DVIG KE ABLAT On NUK . e . 1 3 9 3 . Formatting Table Styles Cel Conditional Format x fe MS 896 % El Merge & Center Sheet1 EN TWIT INTER MEM HENRI et ST WW ed MIN WWW HIM ME OF THE SALA w WER BE WER . 20 2018 2015- 2018 2010 O LE VIK 2001 11.00 2012.01.01 2012-01-01 2010 TO 144 9 7 4 1 1 4 20 21 FOTOS sen MITOL TORS 1 10 21 NET WODOWY WERS TE DE E DE NH HD TOT HORE WWW TOON Www To 10 WHO WE WWE NICE TO TPE TWW W 1990 WE KETE ASLE - wat SERI HON 2 WEER THEm v 14 4 WOLNE WE NOW WE WE WE WRITE OS METRE DETE WA WILL NECTOR TOW WE TEK RT BEME WWWWW WERTY TER SET SET WHOLTSSWR mes to LINUT 190E WIR WEBS SU TOTO EN WWW SHWE WELT THE WERSA O EU EN 100M We SWNTOS WWW WEWE MCHETTEPE WE WERE WE HOTEL OR RO 10 ORO 100* IDONE 2 SM 16 Gel 2016.CIC. 2160 160 - 2.1 2015- 2015-11-02 WA Dele PS 2015 L 1 . . De MP 12 MIN EN NE Th R4 HOW THE 43 BER w MAWO 21 UPEN DEE DVIG KE ABLAT On NUK . e . 1 3 9 3 . Formatting Table Styles Cel Conditional Format x fe MS 896 % El Merge & Center