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

### Instruction:
Bill is trying to control the pests in his garden. Each spider he introduces eats 7 bugs, and each time he sprays the garden he reduces the total bug population to 80% of what it was previously. If the garden has 400 bugs to start, and Bill sprays once and introduces 12 spiders, how many bugs are left?

### Response:
 Kwanza tafuta idadi ya jumla ya wadudu baada ya kupulizia: 80% * 400 wadudu = <<80*.01*400=320>>320 wadudu
Kisha tafuta idadi ya jumla ya wadudu kila buibui anayekula: 12 buibui * 7 wadudu/buibui = <<12*7=84>>84 wadudu
Kisha toa idadi hiyo kutoka kwa idadi ya wadudu waliobaki baada ya kupulizia ili kupata idadi ya mwisho ya wadudu: 320 wadudu - 84 wadudu = 236 wadudu