we don't sell to blondes

A blonde goes to an electronic store and asks the salesperson, pointing at the appliance "how much is this microwave for?" The salesperson replies "Sorry we don't sell to blondes." The blonde is angry and changes her attire and goes to the store the next day with brunette hair, she points to the appliance and asks the salesperson the same question, "How much is this microwave for?" The salesperson gives her the same answer, "Sorry, we don't sell to blondes." The blonde is furious and decides to become a redhead and put lots of makeup to hide her identity and goes to the store the next day and asks the same question to the salesperson and gets the same answer. The blonde is now fed-up and decides to dress like a man. Finally after a week she goes to the store thinking that dressing like a man and going to the store after a week will change the salesperson's mind. She goes in, points to the appliance and asks the salesperson, "how much is this microwave for?" The salesperson replies back "Sorry, we don't sell to blondes". The blonde gives up and asks the salesperson, "how do you know that I am a blonde? I have changed my attire and looks many times and still you find out that I am a blonde, how?" The salesperson replies, "This is not a microwave, it is a TV"