<s>[INST] One major retailer, with 12 stores, is deciding what price to charge for a portable speaker that they buy for $25 each and plan to sell in only one style and only one color. Each store will sell only 1/4 the number of speakers as its sales of wireless earbuds. Their research shows that if they price the wireless earbuds at $99, they can sell 300 pairs in each of the 12 stores. And if they price the wireless earbuds at $79, they can sell 350 pairs in each of the 12 stores.[/INST]