Amandment to section 44ae

Pl. clarify applicability of Sec 44AE in view of amendment made by Finance Act 2018 for current F.Y. 18-19 i.e. A.Y. 2019-20.The amended section uses the words "gross vehicle weight or unladen weight as the case may be @ Rs. 1000/- per ton. Now, the R/C of a heavy Goods Vehicle(HGV) mentions  both the weights i.e. Gross Vehicle weight 49 Tons and Unladen weight 12.2 Tons meaning thereby that the HGV can load maximum 36.8 Tons of Goods. Presumptive Income till March 18 was Rs. 7,500/-p.m. hence if Unladen Weight is taken it will be Rs. 12200/-per Truck  p.m. but if Gross Vehicle Weight is taken it will be Rs. 36,800/- per Truck p.m. making it about 5 times more than  of the present limit. You are requested to clarify why both the weights have simaltaneously been mentioned in the Section, which weight has to be considered for computing Income u/s 44AE and why the word  as the case may be  has been mentioned therein