My grandfather used to work at Dollarama, a Canadian-based retail grocery store, back in 2000. I always remembered that my grandfather worked hard as he was at the billing counter. At the time, they used to take a few minutes to get the billing done due to manual hst calculations. But when my father is doing the same job that my grandfather did, it takes him less time to calculate hst tax on each grocery item. He used the tax calculator at https://hstcalculator.onl, which is 100% free and no login required.