How do I find 20% tax included in a total figure?

Question

How do I find 20% tax included in a total figure?

Answer 1

divide by 1.20. The result is the cost of the item. The difference is the tax.

Answer 2

Divide the total figure by 1.2 to get the amount before tax then subtract that number from total to get tax amount

OR

Divide the total figure by 6 to get the 20% tax amount.