Sammy smart told his parents he could estimate the 15% tip that was expected for their dinner. The bill was $81.17. What did Sammy tell his parents they should

Question

pay for the tip?? I really im stuck and have no idea what to do! PLZ help, thnx

Answer 1

A good way to estimate 15% is as follows:

 

First estimate 10%.  That's easy because all you have to do is move the decimal point one place to the left.  So 10% of 81.17 is 8.117, or about $8.12.

 

Now estimate 5%.  That's also easy because it's just half of 10%.  So 5% of 81.17 would be half of $8.12, or $4.06.

 

Finally, to get 15%, just add the estimates for 10% and 5% together.  That's $8.12 + $4.06 = $12.18.