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

### Instruction:
 John anafanya kazi kama mtaalamu wa IT. Anarekebisha kompyuta zilizovunjika. Siku moja alilazimika kurekebisha kompyuta 20. Asilimia 20 kati yao hazikuweza kurekebishwa, na asilimia 40 kati yao zililazimika kusubiri siku chache ili vipuri vifike. Kompyuta zilizobaki John alizirekebisha mara moja. John alirekebisha kompyuta ngapi mara moja?


### Response:
 Kati ya kompyuta zote, asilimia 100 - 40 - 20 = 40 zilirekebishwa mara moja.
Hivyo, kati ya kompyuta 20, John alirekebisha 40/100 * 20 = <<40/100*20=8>>8.