Lauren spends $140 on groceries per weekly trip on average. She is considering
joining a shopping club with prices that are 20% lower than the prices at her grocery
store, but the shopping club charges a $45 annual fee to join the club. Lauren has
looked at the shopping club's inventory and finds that she can't buy everything she
normally buys at her grocery store. She expects she will still need to spend $20 of
the $140 each week at her grocery store if she joins the club and buys the rest of her
items there. Will she save enough at the shopping club to make up the cost of the
annual fee before the year is over, or should she buy all her items at her grocery store
aniy?