⇣ irretb ⇣irr100etb00014irr500etb00068irr1000etb00136irr2000etb00272irr5000etb00680irr10000etb01360⇣ irretb ⇣irr1,00000etb136irr5,00000etb680irr10,00000etb1360irr25,00000etb3400irr50,00000etb6800irr100,00000etb13601