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

### Instruction:
Last year, the school library purchased 50 new books. This year, it purchased 3 times as many books. If the library had 100 books before it purchased new books last year, how many books are in the library now?

### Response:
 Maktaba ya shule ilinunua vitabu 50 x 3 = <<50*3=150>>150 mwaka huu.
Hivyo, maktaba ilinunua jumla ya vitabu 50 + 150 = <<50+150=200>>200.
Hivyo, maktaba sasa ina jumla ya vitabu 100 + 200 = <<100+200=300>>300.