The user of-course can already implicitly work out this information from comparing the fee-rate with the actual fee.

I think that it would be useful for people not wanting to do this arithmetic in their head.

CAmount nNet = nCredit - nDebit;
    strHTML += "<b>" + tr("Status") + ":</b> " + FormatTxStatus(wtx);
    int nRequests = wtx.GetRequestCount();
    if (nRequests != -1)
    {
        if (nRequests == 0)
            strHTML += tr(", has not been successfully broadcast yet");
        else if (nRequests > 0)
            strHTML += tr(", broadcast through %n node(s)", "", nRequests);
    }
    strHTML += "<br>";
    strHTML += "<b>" + tr("Date") + ":</b> " + (nTime ? GUIUtil::dateTimeStr(nTime) : "") + "<br>";
    
    
    
    if (wtx.IsCoinBase())
    {
        strHTML += "<b>" + tr("Source") + ":</b> " + tr("Generated") + "<br>";
    }
    else if (wtx.mapValue.count("from") && !wtx.mapValue["from"].empty())
    {
        
        strHTML += "<b>" + tr("From") + ":</b> " + GUIUtil::HtmlEscape(wtx.mapValue["from"]) + "<br>";
    }
    else
    {
        
        if (nNet > 0)
        {