"Three times a number" is shown as 3x, "is' refers to an equals sign, "two times" refers to 2 multiplied by "that number" or x, "and one," which is 1. Hope this helps!
We know that because we divide 2.32/80. We have to find out what percent the tax is of the amount paid. The answer comes to 0.029. Multiply it by 100, and you get 2.9%