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%**

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