Tax automatically added?

I notice that tax is automatically added onto the price of the ticket. I believe that there should be an option to decide whether tax is already included. I am organizing a trip, and the cost of participation is €25 total taxes included. But if I put €25 as the “ticket” price, it automatically turns into €35.50. Now I’m doing my algebra to find a price that will suit the plugin so that the total will be €25, but it’s not working because:
n + (n * .22) = 25
solves to n = 1250/61 = 20.4918032787

20.49 + (20.49 * .22) = 24.99
20.50 + (20.50 * .22) = 25.01

You see, it is impossible for me to get exactly €25 total price.
Please make “taxes included” an option for this plugin!

https://www.ads-software.com/plugins/events-manager/