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

### Instruction:
On a 16 GB (gigabyte) capacity USB drive, 50% is already busy. Calculate the number of gigabytes still available.

### Response:
 Tuna: 16 * .5 = <<16*.5=8>>8 GB (gigabyte) tayari imejazwa kwenye kifaa hiki.
Hivyo, GB 16 - 8 GB = <<16-8=8>>8 GB (gigabyte) zilizobaki kwenye kifaa hiki.