So the first thing we do is convert 20% to a decimal ( which makes it easier to muiltiply )
20%=0.2
Then we muiltiply this by $15, to find how much we will tip the driver.
$15X0.2=$3
So we are tipping the driver $3
Finally, we are going to add the $15, which is the total price.
$15+$3=$18
I hope this helped!!
