Product price inclusive of taxes

i am running opencart 3.0.2.0
For Example if i put a cost of the product as INR 100 . For 18% TAX
It should be INR 82
+ 18 tax
total amount = 100
that price is inclusive of taxes. How do i get the option in admin panel while adding product an option with price inclusive of tax.
And also show the same in the invoice.

This is not an option in the admin, you must enter ex-tax prices.