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

### Instruction:
An NGO contracted a construction company to build 2000 houses within one year. In the first half of the year, they built the first 3/5 units of the contracted number. Due to unavoidable circumstances, the company could only build an additional 300 units by October. How many units remain from the contracted number that the company is supposed to build?

### Response:
 Katika nusu ya kwanza ya mwaka, kampuni ilijenga 3/5*2000 = <<3/5*2000=1200>>1200 nyumba.
Idadi ya nyumba zilizosalia kujengwa baada ya kampuni kujenga nyumba 1200 katika nusu ya kwanza ya mwaka ni 2000-1200 = <<2000-1200=800>>800
Kufikia Oktoba, kampuni ilijenga nyumba 300 zaidi, hivyo zimesalia nyumba 800-300 = <<800-300=500>>500 kujengwa.