Assuming your repetition of the word 'percent' was intentional,
30%% means 30 X (1/100) X (1/100) = 0.0030, which is 3/1000.
If the question had been, 'What is 30 percent equal to?', then the correct answer would be 0.3 or 3/10.
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20%
13 GeV
3/10
136.50
90 minus 30 percent - and therefore 30 percent OFF the number, is equal to 90 x (1 - (30 / 100)) = 90 x (1 - 0.3) = 90 x 0.7 = 63. 30 percent OF 90 is equal to 90 x (30 / 100) = 90 x 0.3 = 27