“Special percents” are easy to compute because they represent easy-to-calculate amounts.
0% means “none of it”
25% means “a quarter of it”
50% means “half of it”
100% means “all of it”
200% means “all of it, twice”
To find 100% of 30 we take “all of it”. All of 30 is 30 and so
100% of 30 is 30.
To find 200% of 30 we take “all of it, twice”. All of 30 is 30, and double of 30 is 60. So,
200% of 30 is 60.
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