Tweaking WP E commerce plugin so as to get USD prices converted into INR at checkout by Sarangone

My client has a WordPress online shop with WP E commerce plugin powering the back-end. He wants to sell in India and abroad. The following features are necessary for the same. 1. The shop will have a drop down to select options… (Budget: $30-$250 USD, Jobs: eCommerce, PHP, Shopping Carts, WordPress)