notification dated 2.12.1982 and introduced Clause 13 providing rate of tax on motor tyres and tubes at nine paise in a rupee till March 31, 1992. Notification dated 28.12.1990 was issued fixing the rate of sales tax on the sales of tractor tyres and tubes @ 6% upto March 1992. No fresh notification was issued after 31.3.1992. However, on 20.8.1992, the Punjab Government in exercise of powers conferred under section 5(1) of the Punjab General Sales Tax Act, 1948 (in short, “the Act”) introduced amendment in the notification dated 2.12.1982 to the effect that the rate of tax on motor tyres and tubes shall be nine paise in a rupee and at the rate of six paise in a rupee on tractor tyres and tubes with effect from 1.4.1992 to 31.3.1994. Further amendment was made vide notification dated 1.12.1992, Annexure P.5 that reduced rate of sales tax on the items in question was to be effective from 20.8.1992 and not from 1.4.1992, meaning thereby the amount of tax for the period from 1.4.1992 to 20.8.1992 was to remain 12 paise in a rupee and not 9 paise in a rupee in so far as tax on motor tyres and tubes is concerned and eight paise in a rupee and not 6 paise in a rupee relating to tractor tyres and tubes. The Assessing authority vide order dated 30.8.1993 assessed the petitioner’s sales at the enhanced rate of tax and created additional demand of Rs.16,97,613/-. The Deputy Excise and Taxation Commissioner (Appeals) dismissed the appeal and the second appeal before the Sales Tax Tribunal was partly allowed on 29.5.1996 as the order of penalty under Section 10(6) of the Act was quashed. Application moved by the petitioner for reference was rejected on 7.2.2002. Through the present petition, the petitioner is challenging the validity of the notification dated 1.12.1992, Annexure P.5 being