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

### Instruction:
 Ni zamu ya Yvette kujitunza yeye na marafiki wake watatu bora kwa kuzungusha vikombe vya ice cream. Alicia anauliza kikombe cha peanut butter kwa $7.50. Brant anauliza kikombe cha Royal banana split kwa $10.00. Josh anauliza kikombe cha death by chocolate kwa $8.50 na Yvette anauliza kikombe cha cherry jubilee kwa $9.00. Anamuacha mhudumu wake chakula cha jioni cha 20%. Gharama yake ya mwisho itakuwa kiasi gani?


### Response:
 Yvette alitumia $7.50 + $10.00 + $8.50 + $9.00 = $<<7.50+10+8.5+9=35.00>>35.00 kwa vikombe vya ice cream.
Bili yake inafikia $35.00 na anamuacha mhudumu chakula cha jioni cha 20% kwa hivyo ni 35 * 0.20 = $7.00
Bili ilikuwa $35.00 na aliongeza chakula cha jioni cha $7.00 kwa jumla ya $35.00 + $7.00 = $<<35+7=42.00>>42.00