First option mapped out, still need to print it on screen, logging for

now.

app.js

@@ -0,0 +1,36 @@
+
+/**
+ * Module dependencies.
+ */
+
+var express = require('express')
+  , routes = require('./routes')
+  , user = require('./routes/user')
+  , http = require('http')
+  , path = require('path');
+
+var app = express();
+
+app.configure(function(){
+  app.set('port', process.env.PORT || 3000);
+  app.set('views', __dirname + '/views');
+  app.set('view engine', 'jade');
+  app.use(express.favicon());
+  app.use(express.logger('dev'));
+  app.use(express.bodyParser());
+  app.use(express.methodOverride());
+  app.use(app.router);
+  app.use(require('stylus').middleware(__dirname + '/public'));
+  app.use(express.static(path.join(__dirname, 'public')));
+});
+
+app.configure('development', function(){
+  app.use(express.errorHandler());
+});
+
+app.get('/', routes.index);
+//app.get('/users', user.list);
+
+http.createServer(app).listen(app.get('port'), function(){
+  console.log("Express server listening on port " + app.get('port'));
+});

package.json

@@ -0,0 +1,13 @@
+{
+  "name": "fee calculator",
+  "version": "0.0.1",
+  "private": true,
+  "scripts": {
+    "start": "node app"
+  },
+  "dependencies": {
+    "express": "3.0.0rc4",
+    "jade": "*",
+    "stylus": "*"
+  }
+}

public/javascripts/calc.js

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+function init() {
+  window.onkeyup = feeCalc;
+}
+
+init();
+
+function feeCalc() {
+  var el = document.getElementById('total-amount');
+
+  // option a
+  // paypal > boa > local, chunks of $400
+  var paypalFee = 5.5531697938,
+      boaPerTransFee = 5, // per $400
+      localBankFee = 1.50, // per $400
+      maximumPerWidthdraw = 400;
+
+  // option b
+  // bank to bank
+  var intlTransFee = 33,
+      bncrFee = 12,
+      bacFee = 15;
+
+  var amount = el.value,
+      paypalTakes = (paypalFee * amount)/100,
+      newAmount = amount - paypalTakes,
+      finalAmount = 0,
+      totalWithdrawals = 0;
+
+  console.log("---");
+  console.log("What you see in Paypal: $" + amount);
+
+  if(newAmount < 400) {
+    finalAmount = newAmount - (boaPerTransFee + localBankFee);
+  } else {
+    console.log("After Paypal: $" + newAmount);
+    console.info("Paypal took: $" + (amount - newAmount));
+    totalWithdrawals = Math.ceil(newAmount / maximumPerWidthdraw);
+    finalAmount = newAmount - ((boaPerTransFee + localBankFee) * totalWithdrawals);
+    console.log("Total in fees: $" + (amount - finalAmount) + ", after " + totalWithdrawals + ".");
+  }
+
+  console.log("What you end up with: $" + finalAmount);
+
+}

public/stylesheets/style.css

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+body {
+  padding: 50px;
+  font: 14px "Lucida Grande", Helvetica, Arial, sans-serif;
+}
+a {
+  color: #00b7ff;
+}

public/stylesheets/style.styl

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+body
+  padding: 50px
+  font: 14px "Lucida Grande", Helvetica, Arial, sans-serif
+a
+  color: #00B7FF

routes/index.js

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+
+/*
+ * GET home page.
+ */
+
+exports.index = function(req, res){
+  res.render('index', { title: 'Fee Calculator' });
+};

views/index.jade

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+extends layout
+
+block content
+  h1= title
+  p Welcome to #{title}
+
+  form.calc-form
+    label Monto a recibir: $
+    input(type='text', value='', placeholder='amount in US dollars').total-input#total-amount
+
+  div#result
+    h2 te recomendamos usar
+    p#method

views/layout.jade

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+doctype 5
+html
+  head
+    title= title
+    link(rel='stylesheet', href='/stylesheets/style.css')
+  body
+    div.container
+      block content
+
+  script(src='/javascripts/calc.js')
+