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

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

### Response:
 เราคำนวณ 50% ของ 16 GB:
50/100 * 16 GB = 0.5 * 16 GB = <<50/100*16=8>>8 GB
นั่นหมายความว่ายังเหลือ 16 GB - 8 GB = <<16-8=8>>8 GB ใน USB drive นี้