Edited since didn't account for base damage value: Getting the values is pretty easy. It's just as simple as doing either 1.40/1.60 (1.40 being 87.5% of the value of 1.60) or 1.60/1.40 (1.60 being 1.14x or 114% the value of 1.40). So if you wanted to know how much stronger a 55% bonus is over 28%, you would do either 1.28/1.55 (1.28 being 82.5% of the value of 1.55) or 1.55/1.28 (1.55 being 1.21x or 121% of the value of 1.28).

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