Question

All of the following are ways to write 25 percent of N except A. 0.25 N B. 25N/100 C. 1/4 N D. 25 N The answer is D but I want to know why

Answer 1

It is D because 25 percent is a fraction or a decimal: 25/100.
Therefore A is correct because 25/100 in decimals is 0.25,
B is correct because 25/100 is 25 percent,
1/4 is the same as 25/100 as a fraction
And finally, D is wrong because 25 is not in fraction/decimal/percentage form

Answer 2

In this case, N is just a variable. Lets make N 100.
A. 0.25*100=25 25 is 25% of 100 so this checks out.
B. 25(100)/100=25 25 is 25% of 100 so this checks out too.
C. 1/4= 0.25(100)=25 25 is 25% of 100 so this checks out as well.
D. 25(100)= 2500 2500 is greater than 100 so its more than 100% of 100.

As to why that is, its because you're multiplying the variable by 25, but that wont get you 25% of the variable.