<human>:  Jenine can sharpen a pencil 5 times before it runs out. She needs to sharpen a pencil for every 1.5 hours of use. She already has ten pencils and needs to write for 105 hours. A new pencil costs $2. How much does she need to spend on more pencils to be able to write for 105 hours?
<bot>: How many hours does a pencil last? ** A pencil last 7.5 hours because 5 x 1.5 = <<5*1.5=7.5>>7.5
How many hours will the pencils last? ** The pencils she has will last 75 hours because 10 x 7.5 = <<10*7.5=75>>75
How many more hours does Jenine need? ** She needs 30 more hours of writing because 105 - 75 = <<105-75=30>>30
How many more pencils does Jenine need? ** She will need 4 more pencils to reach this because 30 / 7.5 = <<30/7.5=4>>4
How much will she spend on more pencils? ** She will spend $8 on pencils because 4 x 2 = <<4*2=8>>8
#### 8