DO NOW:  You go to Red Lobster's to eat and spend $125 and the waitress was great and you want to leave her a nice tip.  The general tip is 15% you want to leave a 20% tip ?

first you put 20% into a fraction which is 20 over 100 but you can simplify and its 1 over 5 .and  125 over 1 and 25 over 1.then you multiply the fractions which equals $25