Rosa and her friend are eating out for dinner. the bill is 45.80.they want to leave a 20% tip. how much should they leave for a tip?

Ok this is really easy. you are going to multiply 45.80 by 0.20 you see the two dots on the percent sign % well that is how many spots to the left you are going to move your decimal point. Which well make you have 0.20 instead of 20%. and your answer will be $9.16 and if you want to know the total just add $9.16 to $45.80 then your answer will be $54.96