Describe two methods for finding the total price of a bill that includes a 20%

I have two methods, but I am not sure if they are the methods you are looking for.

Let's say the price of the bill is $10, and you need to add a 20% tip.

You can do:

10 · 0.20 = 2

$2 is the tip, so 10 + 2 = 12

your total price is $12.

Another way is:

10 · 1.20 = 12

The "1" in 1.20 keeps the 10, and the ".20" adds the tip.

I think there are other ways to do it but I do not remember, sorry

.632

step-by-step explanation:

6 * 1/10 = 3/5

3*0.01 = 0.03

3/5 + 0.03 = .63

2*0.002 = .002

.63 + 0.002 = .632