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

### Instruction:
 Annabelle alikusanya kiasi cha $30 kama posho ya kila wiki. Alitumia theluthi yake kununua vyakula visivyo na lishe, kisha akatumia $8 zaidi kununua pipi. Kwa kujuta, anachagua kuokoa kiasi kilichobaki. Alikuokoa kiasi gani?


### Response:
 Ametumia 1/3 * $30 = $<<1/3*30=10>>10 kununua vyakula visivyo na lishe.
Ametumia $8 kununua pipi, jumla ya pesa alizotumia ni $10 + $8 = $<<10+8=18>>18.
Ameokoa $30 - $18 = $<<30-18=12>>12.