Hi, I'm a 5th year ECE student. I'm seeking for help for our thesis. Its a system, where when you put product/s (with RFtag/sticker) on a grocery cart, the price will be scanned and will calculate the total price. And if the customer wishes to put back some of the product/s inside the cart, the cart system will sense it, and automatically deducts the price of that product to the total price. I hope you can help. Thanks in advance. God bless.. I'm looking forward on this.