adding linen fee on additional fees and charges page

Hi, I am trying to add a linen fee when setting up my account. We charge £5 per person per stay for linen if they want it.

I have added it on to the additional fees page but i think it is just showing as the total charge is £5 not per person, and i have 3 different types of accommodations which sleep either 2, 4 or 6 people as a maximum so not sure what is the best way to fix it.

Thanks