(1) recharges 200 to 20 yuan, that is, the actual charge 180 yuan, 180÷200=0.9, which is equivalent to a 10% discount;

(2) Charge 1000 to 200 yuan, that is, actually charge 800 yuan, and 800÷ 1000=0.8, that is equivalent to a 20% discount.

(3) The discount formula is: current price ÷ original price = discount.

Extended data:

(1) Definition of discount: A discount refers to a certain percentage of the original price when buying and selling goods. If it is a 10% discount, it is called a 10% discount or a 10% discount.

(2) Calculation formula of discount:

1) unit commodity discount amount = original price (or including discount price) × discount rate.

2) The actual net income of the seller = the original price of the unit commodity-the discount amount.

(3) Discount type:

1) quantity discount: discount given by manufacturers to distributors, retailers or large customers due to large purchase volume.

2) Cash discount: price discount for buyers who pay the goods in time.

3) Functional discount: it is a discount provided by trade channel members to buyers to perform certain functions, such as promotion, warehousing, accounting records, etc.

4) Seasonal discount: the discount provided by the seller to the buyer of non-seasonal goods or services.

5) Online order discount: discount customers who place orders online.

References:

Baidu encyclopedia-discount