Percent means out of 100, so put 25.5 over 100 to make a (sort of) fraction.
Then multiply both top and bottom by the same number to make the numerator a whole number.
Finally divide top and bottom by their highest common factor.
That's how to do it, this is it being done:
25.5 % = 25.5/100
= 51/200 (multiply top and bottom by 2)
(hcf(51, 200) = 1, so that's reduced as much as it can be.)
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50 percent of 510 is 255.
30% off of 255 = 178.5 = 30% discount applied to 255 = 255 - (30% * 255) = 255 - (0.30 * 255) = 255 - 76.5 = 178.5
85%= 255/300 * 100%= 255/3 * 1%= 85%
2.55%
30%