Tax is not always included in Japan in the shown price①. For example, the 100 yen stores the tax is separate so I know if I pick up five items I am paying 550

Tax is not always included in Japan in the shown price①. For example, the 100 yen stores the tax is separate so I know if I pick up five items I am paying 550 yen.(10% sales tax nationwide for almost everything.) ①However, by law the price tag is required to also show the with tax（税込） price if displaying the without tax price.