Subteras,
а так?
$(function() {
$("#basket").on("input", "div.b_list", function(event) {
var jquery = $(this);
var id = jquery.find('.b_id') .val();
var quantity = jquery.find('.b_quntity').val();
var price = jquery.find('.b_price') .val();
var newPrice = quantity * price||0;
jquery.find('.b_total').val(new_price);});
});