Think of it this way - to move up four inches at 100 you’re looking at 4moa, or 16 clicks. 4moa at 200 will be 8”, so you’ve come up 8” from your original zero. If your original 100 zero was 2” high, and 0 at 200, you’ve come up the equivalent of 4moa, and therefore are now 6” high at 100, and 8 at 200. Bobs your uncle - no need for fancy maths!
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