How do I calculate the Cost of Equity and the Cost of Debt:WACC Analysis Walmart

2018 WACC Analysis

Equity = 383,398,000,000

Debt = 54,591,000,000

Cost of Equity= It is 5.63% but how is that calculated based on the document

Cost of Debt= It is 4.93% but how is that calculated based on the document

Tax Rate= 33.89%

Here is an example of what someone else in the group did. I don't understand how to calculate it.

I found the following document --> https://run.unl.pt/bitstream/10362/35353/1/Abecassis_2018.pdf