GESP 1-4级 -- GESP 5-8级 -- CSP-J/S --

A35009. $Mary bought a box of chocolate that costs 50$. At checkout, a 20% discount was applied, then she used a 10$ voucher. How much does Mary have to pay?$

单选题较难

知识点

百分数计算折扣问题应用题

题目描述

Mary bought a box of chocolate that costs 50$. At checkout, a 20% discount was applied, then she used a 10$ voucher. How much does Mary have to pay?

选项（单选）

A

50$

B

40$

C

30$

D

25$

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