Question 3306
We need to take 15% of 11.65 first.  Since "of" means multiply in algebra, multiply .15 by 11.65 to get the amount of the tip.  That amount is 1.7475.  We need to round since we are talking money.  Since we round to the nearest cent, it would round to $1.75.  After finding the amount of tip, we then add that to the original amount of the bill which is $11.65.  The final bill would be $13.40.  A formula we could use would be (amount of bill) + [(percent)x (amount of bill)] = total bill.