The sales tax of 2.99 with the sales tax itself being 5.5% ... is just 2.99 x 0.055 so if you calculate that it is 0.164. Add the tax with the amount and it becomes 3.15.
Hello i am in grade 9 and we are currently covering this in my math unit. This will work in ANY case: when you have a whole number you present it over one and when you have a percent, over 100,...