 <translate> 100 * .8 = 80 customers bought something. That means they were worth 80 * 25 = $2000. So he gained 2000 - 1000 = $1000 from the ad. The final answer: 1000. <yor> 100 *.8 = àwọn oníbàárà 80 ló ra nǹkan. Ìyẹn túmọ̀ sí pé iye tí wọ́n ní jẹ́ $2000. Nítorí náà, ó gba 2000 - 1000 = $1000 láti inú ìpolówó náà. Ìdáhùn tí wọ́n fún un níkẹyìn ni, ẹgbẹ̀rún kan. 