The following is from a brochure about the admission rate:
Single Annual Membership only $35 (rates plus HST) Family Annual Membership only $50
(covers two adults and their dependant children)
What does "HST" mean in this context?
If the document you got this from is Canadian, then I would guess it's "Harmonized Sales Tax". I simply Googled HST and that was the first hit. It would have been quicker for you to do that than to ask us.