Answer:
By using a factor of 1.20.
Step-by-step explanation:
One way to find the total price including the tip is by multiplying the number by a factor of 1.20, beacuse this factor includes the 20%, actually it represents a 120% of the price.
So, if they say that you have to pay $200, with 20$ tip would be
1.20(200)=240.
It would be $240 with the tipe.
That's how you calculate it.
