This depends on the screen type, the screen size, and also the computer's power. For example; a low power computer may use 200watts, where a high power gaming setup might use 800watts. A screen could use as little as 5watts, if it is a small LCD screen, while a big CRT monitor might use 200watts. Your screen should tell you it's power usage, as should your computer, if you examine the power supply.
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Because computers uses binary as its language. And programs are representation of logic.
Binary
It uses the Binary Numbering System.
Percentage!
1:10 ratio.