suitable tender condition was incorporated in the tender that "The tenderers shall quote their rates based on the price variation formula for the tendered item attached herewith. The two base dates i.e. 01-03-2015 and the first working day of calendar month covering the date one month prior to the date of inspection, as mentioned in the attached price variation formula may please be taken note of. Tenderers should note that the offers on firm price basis or offers based on the price variation formula with explicit deviation vis-à-vis the price variation formula attached with this tender shall be summarily rejected". In above formula, it is stated clearly that price of the material should be based on raw-material price prevailing on 01.03.2015 and for working out the PVC effect, the price of raw-material prevailing on the first working day of the calendar month, covering the date one month prior to the date of inspection will be considered. In the remarks column, you have stated that for terms and conditions, please see our attached sheet. In the attached sheet, you have stated that final price will be taken one month prior to offering the material for inspection. + variation shall be calculated as per IEEMA PVC formula given in your tender.