discount可不可数那为什么 give sb a discount 和 how much discount 并存

discount可不可数那为什么 give sb a discount 和 how much discount 并存 discount可数吗?为什么是there is a discount give a discount.翻译? discount和amount是什么意思? Can you give me discount 什么是trade discount,cash discount,settlement discount? DISCOUNT要用什么提问,HOW MUCH 可以吗 discount discipline discount是什么意思? present discount nominal discount discount是什么意思