update logic for txn eth value on GA

src/components/ExchangePage/index.jsx

@@ -623,13 +623,19 @@ export default function ExchangePage({ initialCurrency, sending = false, params
       }
     }
 
-    let estimate, method, args, value
+    let estimate, method, args, value, ethTransactionSize
 
-    let inputEthPerToken = 1
-    if (inputCurrency !== 'ETH') {
-      inputEthPerToken = inputReserveToken && inputReserveETH ? inputReserveETH / inputReserveToken : null
+    if (inputCurrency === 'ETH') {
+      ethTransactionSize = inputValueFormatted
+    } else if (outputCurrency === 'ETH') {
+      // we want input value * exchangeRate
+      ethTransactionSize = inputValueFormatted * amountFormatter(exchangeRate, 18, 6, false)
+    } else {
+      const tokenBalance = inputReserveETH && new BigNumber(inputReserveToken.toString())
+      const ethBalance = inputReserveETH && new BigNumber(inputReserveETH.toString())
+      let ethRate = ethBalance && ethBalance.div(tokenBalance)
+      ethTransactionSize = inputValueFormatted * ethRate
     }
-    let ethTransactionSize = inputEthPerToken * inputValueFormatted
 
     // params for GA event
     let action = ''