You can simply look at a graph and see if it's the same on both sides at a certain point
Answer:
80% is equivalent to 80/100 which is the same as 0.8 and we can just take a number, for example 10, and we can multiply it by 0.8 and we would get 8 which is 80% of the original value.
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Factors of 21 are : 1,3,7,21....yes, this is correct...true