Sarah visits the specialty grocery store in search of some fresh organic tomatoes for her recipes that will give her as much utility as possible, given her $100/month grocery budget. During the first week of the month, the specialty grocery store was selling organic tomatoes for $2 each and Sarah purchased 3 of them. A sale occurred during the third week of the month, lowering the price of organic tomatoes to $1 each, while all other prices remained the same, so Sarah stocked up with 6 of them. Given this information, plot Sarah's demand curve for organic tomatoes.