Many shops offer their point-card, a discount service. Here, we will consider the relationship between the amount of points and discount ratio.
This form calculates in the following way.
When you pay a 10,000 yen with 5% points, you will get 500 point that can be used for buying a 500-yen goods. Therefore, 10,000yen allows you to buy 10,500 yen goods.
Point 5% equals to Discount ratio: 5 ÷ (100 + 5) ≈ 4.76%