YOUR ANSWER IS : $17.60
Because—— she first bought 2 pumpkin slice lattes for 4.50 EACH so that would be 4.50 time 2, then you would add another 4.20. And finally add another 2.80. After you add all those numbers you will have $16. But you need to find a 10% tip. So divide the total (16 in this case) by 100. After doing this you will have 1% of your total. But you need 10% so you will get that 1 percent (0.16) and multiply it by 10. You will then get $1.6. So you now will add $16 and