title: Multiplying elements in two different lists then summing up the nested loop
body: <p>So I have two sets of nested lists:</p>
  <pre class="lang-py prettyprint-override"><code>l = [[3,4,4],[1,2,1]]
  w = [[2,4,1],[3,1,3]]
  </code></pre>
  <p>I want look at each nested list, multiply the two values of l and w (for example in first nested loop 3*2) then add them all up to make sure each nested list has a total area of less than 40. In the case of the first pair of lists <code>3*2 + 4*4 + 4*1 + 1*3 + 2*1 + 1*3</code> is 34 which is less than 40.</p>