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Which of the following is not valid way to write 25 percent of N?

Which of the following is not valid way to write 25 percent of N?

Explanation

Let's evaluate each option:

  • 0.25N: Valid (25% = 0.25)
  • 25N/100: Valid (25% = 25/100)
  • 1/4N: Valid (25% = 1/4)

However, 25N is not valid because it represents 25 times N, not 25% of N.