title: Multiply only positive values within a column by 100
body: <p>Any values greater than 0 should be multiplied by 100.</p>
  <p>Example dataset:</p>
  <pre><code>df = pd.DataFrame({'col1': ['A','B','C'], 'col2':[-0.42,0.091,0.0023], 'col3': [30, 10,20]})
  
     col1     col2   col3
  0     A    -0.42     30
  1     B    0.091     10
  2     C   0.0023     20
  </code></pre>
  <p>Expected outcome for col2 would look like this:</p>
  <pre><code>   col1     col2   col3
  0     A    -0.42     30
  1     B      9.1     10
  2     C     0.23     20
  </code></pre>
  <p>Not sure how to tackle this one if anyone can provide coding or guidance using python/pandas</p>