Add Special Shipping Costs to Magento Store

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
We need to add an additional shipping cost to orders.

Every 20 lbs of product in the shopping cart should add $9 in what we currently refer to as "additional cost". This covers the shipping cost of the dry ice as well as the cost for the insulated cooler.

A shipment of 1-20 lbs should see a $9 charge. Displayed as a separate line item as when making a purchase on the current site.
21- 40 lbs sees an additional charge of $18, and so on.

This is in addition to the UPS API shipping charges.

Skills required:
Magento, MySQL, PHP
About the employer:
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