To convert a fraction to a percentage, we need to multiply the fraction by 100. So, to find the percentage of 90/25, we need to multiply it by 100.

First, we can simplify the fraction by dividing both the numerator and denominator by 5. This gives us 18/5.

Now, we can multiply 18/5 by 100 to get the percentage.

18/5 x 100 = 360/5 = 72

Therefore, 90/25 as a percentage is 72%.

To summarize, to convert a fraction to a percentage, we need to multiply the fraction by 100. In this case, we simplified the fraction to 18/5 and then multiplied it by 100 to get 72%.