67/91 as a percentage is 73.63%. This value is the rounded result you get when you express the fraction in terms of hundredths.
The fraction 67/91 is a proper fraction, meaning the numerator is smaller than the denominator. It can be simplified only by dividing both numbers by common factors, but 67 and 91 share none, so the fraction stays as it is.
In everyday use, you might see 73.63% on a report card, a sports statistic, or a financial summary. Keeping the percentage to two decimal places makes it easy to read while still being accurate enough for most practical purposes.