 <translate> If the first building was designed to have 4000 units, the second building, which had 2 / 5 times as many units as the first building, was to have 2 / 5 * 4000 = 1600 more units. Together, the first and the second building had to have 1600 + 4000 = 5600. The third building was to have 120 / 100 * 1600 = 1920 units. Altogether, Daleyza won a project that required her to construct 5600 + 1920 = 7520 units.
Thus, the answer is 7520. <yor> Bí wọ́n bá sọ pé kí ilé àkọ́kọ́ ní ẹgbẹ̀rún mẹ́rin ilé, kí ilé kejì tó ní ẹgbẹ̀rún méjì àti ààbọ̀ ilé ju ilé àkọ́kọ́ lọ ní ẹgbẹ̀rún méjì àti ààbọ̀ ilé sí i. Ilé àkọ́kọ́ àti ilé kejì ní láti ní 1600 + 4000 = 5600. Ilé kẹta náà ní láti ní 120 / 100 * 1600 = 1920 iyàrá. Ní gbogbo rẹ̀, Daleyza gba iṣẹ́ kan tó béèrè pé kó kọ́ ilé 5,600 + 1,920 = 7,520. Nítorí náà, ìdáhùn náà ni 7520. 