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

### Instruction:
Daleyza won a house construction project that involved the construction of three houses with several units. The first building was designed to have 4000 units, the second building 2/5 times as many units as the first building, and the third building was to have 20% more units than the second building. How many units were Daleyza contracted to build?

### Response:
 Ikiwa jengo la kwanza lilipangwa kuwa na vitengo 4000, jengo la pili, ambalo lilikuwa na vitengo 2/5 ya jengo la kwanza, lilipaswa kuwa na vitengo 2/5*4000 = 1600 zaidi.
Jumla, jengo la kwanza na la pili lilipaswa kuwa na 1600+4000=5600.
Jengo la tatu lilipaswa kuwa na vitengo 120/100*1600=1920.
Jumla, Daleyza alishinda mradi wa ujenzi uliohitaji kujenga vitengo 5600+1920=7520.