The amount of increase as a fraction of the original amount is 75 / 25 = 3.00 .
To change any number to a percent, move the decimal point 2 places that way ===> .
3.00 = 300% .
The question could have been different.
It could have been "What is the amount of the increase ?" That's 75.
It could have been "How many times larger is 100 than 25 ?" 100 is 4 times as large as 25, and 3 times larger.
It could have been "How many times has 25 been increased ?" This is a terrible question ... there are a lot of those in schools. The answer could be "25 was only increased once, by 75." The answer could be "25 was increased to 4 times its size." The answer could be "25 was increased by 3 times its size."
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