80 is 88.9% of 90.
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80%
% rate= 72/80 * 100%= 0.9 * 100%= 90%
Suppose a 90 dollar item was on sale for 72 dollars. What is the percentage change? Find the difference. 90 - 72 = 18. 18 is 1/5 of 90 or 20%. The percentage of decrease is 20%. Since we subtracted 20% from the original number, the remainder must be 80%. 72 is 80% of 90. (90 x 0.80 = 72)
80% of 90m = 80% * 90 = 0.8 * 90 = 72m
80% of 90 Euros= 80% * 90 Euros= 0.8 * 90 Euros= 72 Euros