80 increased by 100 equates to an increase of 125%
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100 increased by 80% is 100*1.8 or 180.
90 increased by 80 percent of itself is 162.
80 percent of one hundred = 8080% of 100= 80%/100 * 100= 80
100 increased by 60 percent = 160
80 decreased by 100 percent = zero