He arrives, before he's done he's decided that she should do a small casement "garden bay" to replace the kitchen window too. Total price for the job ? $13K. But, after he gives her the 15% for this month, and the "put the sign on your lawn" discount, and this discount, and one for that too, he's down to $6700. What a deal, $13k of work for $6700. :-)
Fortunately she's smart enough to know a rip off. What amazes me is that these guys stay in business.