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The 40" LCD is not 25% bigger. It's 56.25% bigger, in AREA. Each dimension is 25% bigger, and so (1.25*1.25)-1 = 56.25%
To see it simpler, a 40" LCD isn't 2x the size of a 20" LCD. It's 4x the size (i.e. area is the product of the length and width).
The difference between 75% and 56% can be attributed to things like lower manufacturing yields and more advanced technology required to make the bigger versions.
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