Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
Lyka wants to buy a smartphone worth $160 but she only has $40 at the moment. She plans to save an equal amount of money per week for two months for the remaining amount that she needs. How much should she save per week?

### Response:
Two months have 2 x 4 = <<2*4=8>>8 weeks.
The amount that Lyka has to save per week for two months is $160 - $40 = $<<160-40=120>>120.
Hence, Lyka needs to save $120/8 = $<<120/8=15>>15 per week.
#### 15