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Its simple really for example $109 and deduct 25% (109x25=2725) now it makes a whole number 25% between the 5 % is a imaginary decimal move it twice to the right now move that twice in the whole number 27.25
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The first plane invented was created December 12, 1903 by the Wright brothers because of the brothers inspiration for  birds and noticed how the birds changed motion so they wanted to invent such a machine with such tech niches as a bird.