Unable to take the htmlpage value for formula

That's Google Sheets question, isn't it?

When you are retrieving the value, it is returning as text due currency symbol "₹"

Below formula shall be helpful for you.

=VALUE(SUBSTITUTE(INDEX(IMPORTHTML("https://www.goodreturns.in/gold-rates/bangalore.html","table",1),2,2),"₹",""))

If this resolves your query don't forget Mark as Solution.