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

### Instruction:
The perimeter of a square-shaped piece of paper is 20 cm shorter than the height of a computer screen. How many cm is the height of the screen if the side of the square paper is 20 cm?

### Response:
 Umbo la karatasi ya mraba linapata kwa 4*upande, kwa hivyo, kwa kuwa upande wa karatasi ya mraba ni 20, umbo la karatasi ya mraba ni 4*20 = <<4*20=80>>80
Umbo la karatasi ya mraba ni sentimita 20 fupi kuliko urefu wa skrini ya kompyuta, maana urefu wa skrini ya kompyuta ni 80+20 = 100 cm.