I understand you wanted to know the margin for your XAGUSD in AUD account. Since you have 1:100 leverage 2.6 lot, you will get 3,099.85 AUD. Please see detailed computation below:
Formula:
Required Margin = Trade Size / Leverage * Account Currency Exchange Rate
Calculation:
Volume in Lots: 2.6 (One Standard Lot = 100,000 Units)
Leverage: 100
Account Base Currency: AUD
Currency Pair: XAG/USD
Exchange Rate: 16.45900 (XAG /USD)
Required Margin = 260,000 /100 * 16.45900
Required margin is 2,139.67 USD
Convert to your account base currency and that’s equalled to 3,099.85 AUD