title: Loop through dictionary and change values
body: <p>Lets say I have a dictionary with names and grades:</p>
  
  <pre><code>{"Tom" : 65, "Bob" : 90, "John" : 80...}
  </code></pre>
  
  <p>and I want to take all the values in the dictionary and add 10% to each:</p>
  
  <pre><code>{"Tom" : 71.5, "Bob" : 99, "John" : 88...}
  </code></pre>
  
  <p>How can I do it through all the values in the dictionary?</p>