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Copyright (C) 2000-2012 Philippe Troin <webmaster@fifi.org>.
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PPMT(rate,per,nper,pv[,fv,type])
PPMT calculates the amount of a payment of an annuity going towards principal.
Formula for it is:
PPMT(per) = PMT - IPMT(per)
where:
PMT = Payment received on annuity
IPMT(per) = amount of interest for period per
IPMT, PV, FV.
