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

### Instruction:
 James ananunua sarafu 20 za sarafu ya sarafu kwa $15 kila moja. Thamani ya sarafu inaongezeka kwa 2/3. Anauza sarafu ili kurejesha uwekezaji wake wa awali. Amewauza sarafu ngapi?


### Response:
 Alinunua thamani ya $20*15=$<<20*15=300>>300 za sarafu
Thamani ya uwekezaji wake inaongezeka kwa $15*2/3=$<<15*2/3=10>>10 kwa kila sarafu
Hivyo kila sarafu sasa ilikuwa na thamani ya $15+10=$<<15+10=25>>25
Hivyo ameuza sarafu 300/25=<<300/25=12>>12