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

### Instruction:
Natalie's sister had 8 small diaries in her locker. Last summer she bought double the number of diaries she had and then lost 1/4 of what she had. How many diaries does Natalie's sister have now?

### Response:
 Dada wa Natalie alinunua 2 * 8 vitabu = <<2*8=16>>16 vitabu.
Hivyo, alikuwa na vitabu 16 + 8 vitabu = <<16+8=24>>24 vitabu.
Baadaye, alipoteza 1/4 * 24 vitabu = <<1/4*24=6>>6 vitabu.
Hivyo, sasa ana vitabu 24 vitabu - 6 vitabu = <<24-6=18>>18 vitabu.