nCase 5.￿7KH￿FDOFXODWRU￿GLVSOD\V￿￿No Solution￿￿7KHUH￿LV￿QR￿DQVZHU￿￿ 7KLV￿VLWXDWLRQ￿PLJKW￿EH￿WKH￿UHVXOW￿RI￿DQ￿HUURU￿￿VXFK￿DV￿D￿PLVWDNH￿LQ￿ NH\LQJ￿LQ￿WKH￿FDVK￿IORZV￿￿$￿FRPPRQ￿PLVWDNH￿WKDW￿UHVXOWV￿LQ￿WKLV￿ PHVVDJH￿LV￿SXWWLQJ￿WKH￿ZURQJ￿VLJQ￿RQ￿D￿FDVK￿IORZ￿￿$￿YDOLG￿FDVK￿IORZ￿ VHULHV￿IRU￿DQ￿,55￿<5￿FDOFXODWLRQ￿PXVW￿KDYH￿DW￿OHDVW￿RQH￿SRVLWLYH￿DQG￿

RQH￿QHJDWLYH￿FDVK￿IORZ￿

Halting and Restarting IRR/YR

7KH￿VHDUFK￿IRU￿,55￿<5￿PD\￿WDNH￿D￿UHODWLYHO\￿ORQJ￿WLPH￿￿<RX￿FDQ￿KDOW￿WKH￿ FDOFXODWLRQ￿DW￿DQ\￿WLPH￿E\￿SUHVVLQJ￿WKH￿%￿NH\￿￿7KH￿PHVVDJH￿Interrupted￿LV￿ GLVSOD\HG￿￿3UHVVLQJ￿R￿QRZ￿GLVSOD\V￿WKH￿FXUUHQW￿HVWLPDWH￿IRU￿,55￿<5￿￿ <RX￿FDQ￿UHVXPH￿WKH￿FDOFXODWLRQ￿E\￿

n3UHVVLQJ￿*!*9￿ZKLOH￿WKH￿FXUUHQW￿HVWLPDWH￿LV￿GLVSOD\HG￿LQ￿WKH￿

FDOFXODWRU￿OLQH￿￿7KLV￿FRQWLQXHV￿WKH￿FDOFXODWLRQ￿IURP￿ZKHUH￿LW￿OHIW￿RII￿

n6WRULQJ￿D￿JXHVV￿IRU￿,55￿<5￿￿GLVFXVVHG￿EHORZ￿

Entering a Guess for IRR/YR

7R￿HQWHU￿D￿JXHVV￿￿NH\￿LQ￿DQ￿HVWLPDWH￿RI￿,55￿<5￿DQG￿WKHQ￿SUHVV￿ *!*9￿￿<RX￿FDQ￿HQWHU￿D￿JXHVV￿IRU￿,55￿<5￿DW￿WKHVH￿WLPHV￿

n%HIRUH￿EHJLQQLQJ￿WKH￿FDOFXODWLRQ￿￿$￿IDLUO\￿DFFXUDWH￿JXHVV￿FDQ￿UHGXFH￿

WKH￿WLPH￿UHTXLUHG￿WR￿FDOFXODWH￿DQ￿DQVZHU￿DQG￿UHGXFH￿WKH￿FKDQFH￿RI￿ WKH￿FDOFXODWRU￿VROYLQJ￿IRU￿DQ￿XQGHVLUDEOH￿QHJDWLYH￿VROXWLRQ￿

n$IWHU￿\RX·YH￿LQWHUUXSWHG￿WKH￿FDOFXODWLRQ￿

n$IWHU￿WKH￿FDOFXODWRU￿KDV￿KDOWHG￿WKH￿FDOFXODWLRQ￿GXH￿WR￿DQ\￿RI￿WKH￿ DIRUHPHQWLRQHG￿FDVHV￿￿+RZHYHU￿￿IRU￿FDVHV￿￿￿DQG￿￿￿￿QR￿RWKHU￿

VROXWLRQV￿ZLOO￿EH￿IRXQG￿

:KHQ￿FDOFXODWLQJ￿,55￿<5￿XVLQJ￿D￿JXHVV￿￿WKH￿FDOFXODWLRQ￿KDOWV￿ZKHQ￿LW￿ ILQGV￿DQ￿DQVZHU￿￿+RZHYHU￿￿WKHUH￿PD\￿EH￿DGGLWLRQDO￿SRVLWLYH￿RU￿QHJDWLYH￿ DQVZHUV￿￿RU￿QR￿WUXH￿VROXWLRQ￿DW￿DOO￿￿<RX￿FDQ￿FRQWLQXH￿VHDUFKLQJ￿IRU￿

DQRWKHU￿VROXWLRQ￿E\￿KDOWLQJ￿WKH￿FDOFXODWLRQ￿DQG￿HQWHULQJ￿D￿GLIIHUHQW￿JXHVV￿

2QH￿ZD\￿WR￿REWDLQ￿D￿JRRG￿JXHVV￿IRU￿,55￿<5￿LV￿WR￿FDOFXODWH￿WKH￿139￿IRU￿ YDULRXV￿LQWHUHVW￿UDWHV￿￿6LQFH￿,55￿<5￿LV￿WKH￿LQWHUHVW￿UDWH￿DW￿ZKLFK￿139￿ HTXDOV￿]HUR￿￿WKH￿EHVW￿HVWLPDWH￿RI￿,55￿<5￿LV￿WKH￿LQWHUHVW￿UDWH￿WKDW￿\LHOGV￿ WKH￿YDOXH￿IRU￿139￿FORVHVW￿WR￿]HUR￿

130 B: More About Calculations