How can I simplify this code

[elemelas]

Quick question guys, is there any way to put below into some sort of loop ? or something different that will make the code shorter?

if($total_weight<=100) { $postage = 2.20; }
else if($total_weight<=250) { $postage = 2.70; }
else if($total_weight<=500) { $postage = 3.85; }
else if($total_weight<=1000) { $postage = 6.00; }
else if($total_weight<=1500) { $postage = 7.50; }
else if($total_weight<=2000) { $postage = 7.50; }
else if($total_weight<=2500) { $postage = 8.70; }
else if($total_weight<=3000) { $postage = 9.80; }
else if($total_weight<=3500) { $postage = 11.00; }
else if($total_weight<=4000) { $postage = 12.00; }
else if($total_weight<=4500) { $postage = 13.00; }
else if($total_weight<=5000) { $postage = 14.00; }
else if($total_weight<=6000) { $postage = 15.00; }
else if($total_weight<=7000) { $postage = 16.00; }
else if($total_weight<=8000) { $postage = 17.00; }

[Derokorian]

$weight_price = array(
   100 => 2.20,
   250 => 2.70,
   500 => 3.85,
   // etc
);
foreach( $weight_price as $wt => $pr ) {
   if( $total_weight <= $wt ) {
      $postage = $pr;
      break;
   }
}

That's how I would do it personally. Much easier then to just add more measurements as needed in the future as well (though I would store the values in a db table, instead of hard coded)