title: Use of $ in postfix expression
body: <ol>
  <li><p>The value of the postfix expression <code>8 3 4 + - 3 8 2 / + * 2 $ 3 +</code> is:</p>
  
  <p>a) 17</p>
  
  <p>b) 131</p>
  
  <p>c) 64</p>
  
  <p>d) 52</p></li>
  <li><p>Prefix of <code>A-B/C*D$E</code> is:</p>
  
  <p>a)<code>-/*$ACBDE</code></p>
  
  <p>b)<code>-ABCD*$DE</code></p>
  
  <p>c)<code>-A/B*C*$DE</code></p>
  
  <p>d)<code>-A/BC*$DE</code></p></li>
  </ol>
  
  <p>Can anybody explain to me how to solve these expressions when a <code>$</code> sign is present? What does this dollar sign indicate?</p>