Hello, Limegreenpoka! This question is really easy! Here, I'll show you how to solve this.
You just have to divide the numerator by the denominator and then multiply what you get by 100. So, divide 75 by 100 and you get 0.75. Now multiply 0.75 by 100 or here's a hint (just move the decimal two places to the right). Now, you get 75 which is the percent! So, your answer is 75%. You can also use Excellency's method! His method is also correct!
~Hope it helps :)