Calculate total amount using jQuery

Please refer to the image in the attached zip file. I need to achieve following behaviour using jQuery and/or Javascirpt: 1. Input fields A and B only allow numeric characters 0-9. If a user tries to type anything else it should be ignored. 2. Fields B, D and E should automatically be updated as soon as a value of A and/or C changes. 1. B = A * 3 2. D = B + C or D = A * 3 + C 3. E = A * 5 + C * 2 ## Deliverables Please refer to the file attached. To help me select a right bidder, Please state your time availability to do this project and provide references to other related projects that you have done. Special note for agencies. I only work with individuals. If you are an agency than I require that the bid is placed by the person who will be doing the job, including his/her experience and time availability.