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

### Instruction:
 Kalamu ya kuzungushia inagharimu $15, na mpangilio wa kibinafsi unagharimu $10. Itagharimu kiasi gani jumla kununua kalamu za kuzungushia 4 na mipangilio ya kibinafsi 8 kwa punguzo la 20%?


### Response:
 Gharama jumla ya kalamu za kuzungushia ni kalamu za kuzungushia 4 * $15 = $60
Gharama jumla ya mipangilio ya kibinafsi ni mipangilio ya kibinafsi 8 * $10 = $80
Gharama jumla ya bidhaa zote ni $80 + $60 = $140
Punguzo ni 20% * $140 = $28
Bei ya mwisho itakuwa $140 - $28 = $112