The fastest way would be to create a calculated field (see those are dimension values).
Also, your graph might look better if it is stacked bar (horizontal) because you would be able to understand the proportions a lot easier
You can change it from alias. Just Right click on respective dimension >> click on alias >> change alias value as you want.
Hope it will fix your issue.
Split Salary Range using Split Function ,then convert it into currency . then only you can convert it into $20k.
Share your workbook please.
But it needs to be s string and show the range, not a single value
again you can convert it into string, By concatenating the values
"Start value" + " " + End Value"
This will give back the old Salary range , with edited values.
Please Share your Workbook there is a way to produce an output as you expected