demanding

Some customers can be real demanding. They want use to reduce our price no matter what.

A customer, an old lady, would buy milk powder from me and wants me to reduce for her. She would say out the desired price but it would mean that I am selling at a lost.

I have to explain to her that my profit is just a mere 50 sen but she wouldn't believe it. After much arguing, I have to give her more but I just earn little. She's satisfied and each time when she  comes she would demand that price..