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be 50% of the serviceman's entire billing to the service customer. When, however, a serviceman contracts to design, develop, and produce special order machinery or equipment, the tax imposed by this Act shall be based on the serviceman's cost price of the tangible personal property transferred incident to the completion of the contract. Beginning on July 1, 2000 and through December 31, 2000, with respect to motor fuel, as defined in Section 1.1 of the Motor Fuel Tax Law, and gasohol, as defined in Section 3-40 of the Use Tax Act, the tax is imposed at the rate of 1.25%. With respect to gasohol, as defined in the Use Tax Act, the tax imposed by this Act shall apply to (i) 70% of the cost price of property transferred as an incident to the sale of service on or after January 1, 1990, and before July 1, 2003, (ii) 80% of the selling price of property transferred as an incident to the sale of service on or after July 1, 2003 and on or before July 1, 2017, (iii) 100% of the selling price of property transferred as an incident to the sale of service after July 1, 2017 and prior to January 1, 2024, (iv) 90% of the selling price of property transferred as an incident to the sale of service on or after January 1, 2024 and on or before December 31, 2028, and (v) 100% of the selling price of property transferred as an incident to the sale of service after December 31, 2028. If, at any time, however, the tax under this Act on sales of gasohol, as defined in the Use Tax Act, is imposed at the rate of 1.25%, then the tax imposed by SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468