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JavaScript Practice Questions And Answer

Problem: Write a program for generating electricity Bill. Accept last month unit and current month unit from user, then calculate and print bill amount according to following condition:
0-150 charges 4 rs/unit
151-300 charges 6 rs/unit
301-500 charges 8rs/unit
>500 charges 10rs/unit
Solution:

<html>
 <head>
  <script>
   function electBill()
  {
    var last = 6700
    var current = 6830
    var totalUnit = current-last 
    if(totalUnit>0 && totalUnit<=150)
    {
      var charges = totalUnit*4
      document.write("Bill amount:" + charges )
    }
     else if(totalUnit>=151 && totalUnit<=300)
    {
      var charges = totalUnit*6
      document.write("Bill amount:" + charges )
    }
     else if(totalUnit>300 && totalUnit<=500)
    {
      var charges = totalUnit*8
      document.write("Bill amount:" + charges )
    }
     else
    {
      var charges = totalUnit*10
      document.write("Bill amount:" + charges )
    }
   }
  </script>
 </head>
    <body>
        <input type="button" value="Go" onclick="electBill()"/>
    </body>
</html>

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