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

### Instruction:
Shelby had $20 to take to the book fair. She bought one book for $8 and another for $4. She decided to buy as many $4 posters as she could with the money she had left. How many posters can she buy?

### Response:
 Alichagua kutumia $8 + $4 = $<<8+4=12>>12 kwa vitabu.
Alikuwa na $20 mwanzoni, hivyo anabakiwa na $20 - $12 = $<<20-12=8>>8 za kutumia kwa michoro.
Kila michoro inagharimu $4, hivyo anaweza kununua $8 / $4 = <<8/4=2>>2 michoro.