Based on the information of the last 61 monthly prices on the websites,

I calculated the monthly returns for each of the assets of IBM.

Please look at the 2 attached files.

1. Did I calculate correctly?

2. Is this formula correct?

Formula

Monthly Return = (Closing Price on Last Day of Month / Closing Price on Last Day of Previous Month) - 1

3. Am I using this formula correctly to get the monthly returns?

A 24 2 monthly returns for each of the assets. 25 Dates Close Monthly Returns 26 1-May-23 127.26 0.67% 27 1-Apr-23 126.41 -3.57% 28 1-Mar-23 131.09 1.38% 29 1-Feb-23 129.3 -4.03% 30 1-Jan-23 134.73 -4.37% 31 1-Dec-22 140.89 -5.38% 32 1-Nov-22 148.9 7.67% 33 1-Oct-22 138.29 16.40% 34 1-Sep-22 118.81 -7.50% 35 1-Aug-22 128.45 -1.79% 36 1-Jul-22 130.79 -7.37% 37 1-Jun-22 141.19 1.69% 38 1-May-22 138.84 5.01% 39 1-Apr-22 132.21 1.68% 40 1-Mar-22 130.02 6.13% 41 1-Feb-22 122.51 -8.28% 42 1-Jan-22 133.57 -0.07%\fyahoo! finance Search for news, symbols or companies Q Sign in Mail Currency in USD & Download Date Open High Low Close* Adj Close** Volume May 19, 2023 126.79 128.29 126.55 127.26 127.26 4,303,702 May 09, 2023 1.66 Dividend yahoo!finance May 01, 2023 126.35 128.29 120.55 127.26 125.55 59,846,400 NEW: EXPERIENCE OUR Apr 01, 2023 130.97 132.61 124.56 126.41 124.71 83,679,400 BEST CHARTS YET. Mar 01, 2023 128.90 131.48 121.71 131.09 129.33 138,239,000 Explore new charts Feb 09, 2023 1.65 Dividend Feb 01, 2023 134.49 137.39 128.86 129.30 126.01 76,080,200 People Also Watch Jan 01, 2023 141.10 147.18 132.98 134.73 131.30 105,575,000 Symbol Last Price Change % Change CSCO 49.13 +0.93 Dec 01, 2022 +1.93% 149.98 153.21 137.20 140.89 137.31 86,424,100 Cisco Systems, Inc. Nov 09, 2022 1.65 Dividend INTC 29.93 +0.25 +0.84% Intel Corporation Nov 01, 2022 138.25 150.46 133.97 148.90 143.40 93,661,300 ORCL 102.84 +0.50 +0.49% Oracle Corporation Oct 01, 2022 120.16 138.86 115.55 138.29 133.19 113,478,200 JNJ 158.91 +0.43 +0.27%