<human>:  Carrie wants to buy a new iPhone. The new iPhone costs $800. She can trade in her Samsung Galaxy for $240. She can make $80 per week babysitting. How many weeks does she have to work before she can purchase the iPhone?
<bot>: How much will the iPhone cost? ** The total cost of the iPhone will cost Carrie $800 - $240 = $<<800-240=560>>560.
How many weeks does she have to work before she can purchase the iPhone? ** It will take her $560 / $80 = <<560/80=7>>7 weeks to earn enough money.
#### 7