Looking for TVM contributions

[SlideRule]

from an unknown but astute source;

EXCEL uses a slightly different TVM equation in solving for interest rate … making it most useful

PV(1+RATE)^NPER + PMT (1+RATE*TYPE)[{(1+RATE)^NPER} - 1] / RATE + FV = 0

This equation holds true i.e. it equals ZERO when at least one or at most two of the three variables of PV, FV, and PMT are negative.

BEST!
SlideRule