answersLogoWhite

0

Probably the quickest way:

Move the decimal point one place to the left - that will give you 10%.

Double the answer - that will be 20%.

So 20% of 42.30

step 1: 4.23

step 2: 8.46

Done!

User Avatar

Wiki User

14y ago

Still curious? Ask our experts.

Chat with our AI personalities

BeauBeau
You're doing better than you think!
Chat with Beau
LaoLao
The path is yours to walk; I am only here to hold up a mirror.
Chat with Lao
FranFran
I've made my fair share of mistakes, and if I can help you avoid a few, I'd sure like to try.
Chat with Fran

Add your answer:

Earn +20 pts
Q: How can you quickly calculate 20 percent of any bill amount?
Write your answer...
Submit
Still have questions?
magnify glass
imp