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electricity bill program in php

Write a program to calculate the electricity bill. The rates of electricity per units are as follow:

If the units consumed are equal or less than 300, then the cost is Rs.3/-per unit.

If units consumed are more than 300, then the cost is Rs. 3.5/- per unit and a surcharge of 5% of bill is added.

Create a HTML file with name ( Bill.HTML ) create a form like this

<form action="data.php" method="post">

Enter current reading: <br/><input type="text" name="cu"/><br/>

Enter previous reading :<br/><input type="text" name="pu"/><br/>

<input type="submit" name="submit" value="submit"/>

</form>

Create another file with name (data.php) write a code

<?php

$cu = $_POST['cu'];

$pu = $_POST['pu'];

$units=$cu-$pu;

if ($units>300)

                $bill=$units*3.5 + $units*0.05/100;

if ($units<=300)

$bill=$units*3.0;

{

                echo “Electricity Bill: ".$bill;

}

?>