How can I apply multiple conditions in pandas?
For example I have this dataframe

```
Country   VAT        
RO       RO1449488
RO       RO1449489
RO       RO1449486
MD       2980409450027

```

For example I want for the Countries with RO, to delete the "RO" from VAT and remain just number.
Or for example if the Country is not RO and let(VAT) is 13, to add "03" in front of VAT

Output to be like

```
Country   VAT        
RO       1449488
RO       1449489
RO       1449486
MD       032980409450027

```

I know how to do this with openpyxl, but pandas is new for me and I find pandas syntax to be harder to understand.