This page calculates the price before the discount.
In Japan, we use % for denoting ratio, but we also use wari(割) for indicating rate.
1-wari means 10%. Often used is a 1-waribiki(割引). Wari(割) means rate. Hiki(引) means a minus(discount).Waribiki(割引) means a discount rate. H is vocalized to b when it appears in the middle of a word.
When you see ％ notation
When you see ％ notation, the form below will be helpful.