I have asked the furniture design company to help me making furnitures.  The price they charge me is around $76,000.

After I make the partial deposit, I have some interesting on how to calculate each furnitures price ler?

I then ask him to calculate the price on each furniture 'in front' of me.  At last, it reveals that the price is $6,000 more than what I used to pay. So only $70,000 is enough!
  

SO, this story tells us that...
Calculate the price of each individual furniture and ask them how make up the price of each individual furnitures b4 you make the payment!!

oh.......which co?

So have you ask them to charge you $6000 less, since you have not make the full payment ma.....

Yes, sure!!  I think it is not the only company doing this 'error', other furniture companies are the same.  So please pay extreme caution of it!