For an introduction into LINQ have a look here:
[HowTo] LINQ (VB.Net) Learning Catalogue - Help / Something Else - UiPath Community Forum
An overview of the different option to update a datacolumn value find here:
[HowTo] Overview on different options for grouping data and processing the groups - News / Tutorials - UiPath Community Forum
When both cases are to do with LINQ (e.g. for learning purpose)
Case 1:
- DataTable Reconstruction approach
- parsing number to Double
- multiply
- recreate the itemArray
- add row to the cloned Datatable
Case 2:
- Where Operator along with number parsing
Let us know if further assistance is needed