How to change the price of the product when clicking on the checkbox?

Question

WooCommerce

Hello!
I have items on my site. There is also a separate checkbox for all products.
For example, a product costs 100 rubles, when you click on this checkbox, it should cost 80 rubles (that is, not 20 is subtracted from 100, to get 80, but the price is updated to 80)
How to do this?)
Thank you in advance for the articles / answer by decision .