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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Multiply the pre-VAT amount by 0.12
1096.50
Divide the 2450 by 1.14 which gives you 2149.12, then subtract that from the original number to reveal the VAT amount of 300.88. This works for any figure you want to remove a percentage from.
Not unless you can program a key with the VAT rate, since the tax rate varies from one country to another and calculator makers prefer to make a model that will sell across the world rather than in only one country.
The amount of matter is given space is mass.