Why? Because that's what "complement" means. For example, if 60% of a certain population are adults, the remainder - 40% - are not adults. That's the complement. The "100%" refers to the total population in this case.
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to find percent deviation you divide the average deviation into the mean then multiply by 100% . to get the average deviation you must subtract the mean from a measured value.
firstly, find 15 per cent of 450, by dividing 450 by 100 and then multiplying it by 15. After you've found this, subtract this from 450. :)
Multiply it by (100 percent minus 9 percent). (100 - 9) percent = 91% = 91/100 = 0.91 45,000 x 0.91 = 40,950
Take the old value and subtract from the new value, then divide by the old value. Multiply by 100. That number representsthe percent change.