show the rate of tax in order I've create Tax Rate of 20% in VAT type of tax.

It is now displayed in the checkout process and in order view.

What I want now is to show the rate i have created, which is 20%, in the checkout and in order?

Any help will be greatly appreciated.

Thank you!
Not sure if this is what you want to do but could you just not rename the display name of your tax to 20%?

Go to admin/commerce/config/taxes click edit on your tax and under display title enter 20% tax or what you wish the display name to be.