self Maths Puzzle Numerical Ability Permutation and Combination

i have 100 rs i want to buy 100 animals horse 0.75paise donkey 0.25paise elephant 5rs

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self Other Question

30 65 25
28 79 36
32 ?? 24
options are
28
23
43
48
A Z B Y D W G T ? ?
Which two letters come next?