The superb salesman

I met a superb salesman.Why I said that ? I just want to buy one bag less then NT:1000.Eventually , I bought 3 bags more than NT:4000.

I couldn't choice one of the both and though them which one exactly fitted me quite long .The salesman push both as well then gave me a discount.What was distinction between them?

Promax was standard and Nike's bag was bigger.Promax one was much better design.Both are computer bags but Promax one is more useful and friendly and Nike one is just bigger.If I want to go somewhere for couple days.Nike's one will be much better.

What is that? Why I bought it? It is their promotion.If the customers consume more than NT:4000.Their company offers NT:400 bonus.So Totally,I spent [1800(Nike)+1500(Promax)+700(small)-400(bouns)]=3600 NT dollars.

I always asked to myself after I bought something.If the answer is possitive,everything is alright.Doesn't matter how much I spend.So far , my answer is pretty good.