title: Rounding a value to the nearest 50
body: <p>I want to round values to its nearest 50.
  For e.g. </p>
  
  <pre><code>121 should get rounded to 100
  129 should get rounded to 150
  178 should get rounded to 200
  165 should get rounded to 150
  </code></pre>
  
  <p>I have tried the following functions...</p>
  
  <pre><code>=FLOOR(C629,50)
  =FLOOR((C629+50),50)
  =CEILING(C631,50)
  </code></pre>
  
  <p>But I am still not getting the results as expected.</p>