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Assuming this refers to VAT as Value-added-tax, you need to know what the VAT rate is, in addition to the TotalAmt.

TotalAmt = origAmt + VATrate*origAmt = origAmt(1+VATrate)

origAmt = TotalAmt/(1+VATrate)

VATAmt = origAmt*VATrate = VATrate*TotalAmt / (1+VATrate)

For example, if your total is 10.50, and the VAT rate is 5%, The VAT amount would be:

VATamt = (.05)*(10.50) / (1.05) = .50

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Q: How do you separate vat amount from given amount?
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