⇣ irretb ⇣irr100etb00014irr500etb00068irr1000etb00136irr2000etb00273irr5000etb00682irr10000etb01364⇣ irretb ⇣irr1,00000etb136irr5,00000etb682irr10,00000etb1364irr25,00000etb3410irr50,00000etb6820irr100,00000etb13640