198182 php ajax js Invoice calculator

Invoice calculator for calculating estimate cost of shipping based on product(s) weight, so visitor enters the weight of the items (up to 10 form field) and clicks calculate. SUM of weight will equal to particulr price of the weight like 10 LBS is $56. in addition there must be a checkbox "handling" that adds another $5 to total. Total = cost per weight + possible handling and %20 fixed rate. can communicate for further details. Prefer bidders with Russian or English language