why my if else code is not working

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PHP

Welcome <?php echo $_GET["name"]; ?><br>
Your email address is: <?php echo $_GET["email"]; ?><br>

<?php
if ($_GET["ano"]<=1000) {
    $num=16000;
    echo "Your salary is ₹", number_format($num);
} else if($_GET["ano"]>=1000 || $_GET["ano"]<=2000) {
    $num=35000;
    echo "Your salary is ₹", number_format($num);
}

else {
    $num=50000;
    echo "Your salary is ₹", number_format($num);
}

?>
<form action="$_GETt1.php" method="get">
<input type="submit" value="GO BACK">
</form>

when i input value less than 1000, it gives me right result.

when i enter value more than 1000, less than 2000, it gives me correct answer.

But, if i input more than 2000, it again gives me salary as 35000 which actually lies in 1000 and 2000 segment.

can someone help me?