 <translate> 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?
Thoughts? Step-by-step reasoning: <yor> Daleyza gba ẹ̀bùn iṣẹ́ ìkọ́lé kan tó ní í ṣe pẹ̀lú kíkọ́ ilé mẹ́ta tí wọ́n pín sí oríṣiríṣi ẹ̀ka. Ilé àkọ́kọ́ ni wọ́n ṣe láti gba ẹgbàá mẹ́rin ilé, ilé kejì ni wọ́n ṣe fún ìlọ́po méjì sí márùn-ún ilé àkọ́kọ́, ilé kẹta sì ní láti gba ìdá ogún nínú ọgọ́rùn-ún ilé sí ilé kejì. Ẹ̀ka mélòó ni Daleyza gbà láyè láti kọ́? Ṣé o ní èrò kan? Àlàyé tó ṣe ṣísẹ̀-n-tẹ̀lé: 