In reading 40, two formulas are given:

Equation (7)

F0(T)=QF0(T)CF(T)=FV0,T[S0−PVCI0,T]=FV0,T[B0(T+Y)+AI0−PVCI0,T]

https://drive.google.com/open?id=1WjArM6iP5FPf5GpdO_xDcC3kBY6hExZn

Equation (8)

QF0(T)=[1/CF(T)]{FV0,T[B0(T+Y)+AI0]−AIT−FVCI0,T}

https://drive.google.com/open?id=1uCCuHDJH8tf0d0Io_ASglt8lwishdmQP

However, some quick algebra operation will reveal the two formulas are different. There is an extra AI(T) in equation (8). Anyone knows which formula to use?