title: adding numbers in for loop javascript
body: <p>I need to sum all my numbers from a for loop with javascript</p>
  
  <pre><code>var nums = ['100','300','400','60','40'];
  
  for(var i=1; i &lt; nums.length; i++){
  
          var num = nums[i] + nums[i];
  
          alert(num);
  }​
  </code></pre>
  
  <p>can someone help <a href="http://jsfiddle.net/GYpd2/1/" rel="noreferrer">http://jsfiddle.net/GYpd2/1/</a></p>
  
  <p>the outcome i am looking for is 900</p>