During the first year, abc's stock starts at $100 and increases 100%. during the second year, its stock prices goes down 25% from its price at the end of the year. what is the price of the stock, in dollars, at the end of the second year?

Arestaurant offers delivery for their pizzas. the total cost the customer pays is the price of the pizzas, plus a delivery fee. one customer pays $23 to have 2 pizzas delivered. another customer pays $59 for 6 pizzas. how many pizzas are delivered to a customer who pays $86?