(1) in the case of products referred to in paragraph 1 of section 48:(a) designed to be used in the internal combustion engines of light motor vehicles, on the basis of 84.6% of the quantity of that type of oil marketed in the year;
(b) designed to be used in the internal combustion engines of heavy vehicles and equipment, on the basis of 66.4% of the quantity of that type of oil marketed in the year;
(c) designed for the operation of hydraulic systems, other than those referred to in subparagraph d, on the basis of 56% of the quantity of that type of oil marketed in the year;
(d) designed for the operation of tractor hydraulic systems, on the basis of 79.6% of the quantity of that type of oil marketed in the year;
(e) designed for the operation of automatic transmission systems, on the basis of 73.6% of the quantity of that type of oil marketed in the year;
(f) designed to be used in railroad engines, on the basis of 36.7% of the quantity of that type of oil marketed in the year;
(g) designed to be used in marine engines, on the basis of 40% of the quantity of that type of oil marketed in the year;
(h) designed for the operation of differentials, on the basis of 74.8% of the quantity of that type of oil marketed in the year;
(i) designed for the operation of industrial gears, on the basis of 90% of the quantity of that type of oil marketed in the year;
(j) designed for any other use that those in subparagraphs a to i, on the basis of 86.8% of the quantity of that type of oil marketed in the year;