Let's work out a couple examples to clarify it. If a berry is worth $1, then a 10% sales tax on 10 berries is $1, which is 1 berry. If a berry is worth $10, t

Let's work out a couple examples to clarify it. If a berry is worth $1, then a 10% sales tax on 10 berries is $1, which is 1 berry. If a berry is worth $10, then a 10% sales tax on 10 berries is $10, which is 1 berry. So what we see here is that the government is taxing 10% berry value at all the different values of a dollar.