Hi Sameer
Out of the box there is no prefix to the costs
If one has been added you can modify the setting by
Go to the WSS site and click on Risks in the Quick Launch bar
Go to modify settings and columns
Scroll down to Columns
Click on Cost
Make your changes and save
If you want to change the regional settings for the site instead...
Go to the WSS site and click Site Settings in the Menu Bar
Click on Go to Site Administration
Click on Change Regional Settings (under Management & Statistics)
Choose your local and save
I hope one of these helps
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Regards
Chris Marriott - PMP MCSE MCDBA
UK - EPM Consultant & Trainer