static public double ppmt(double r, int per, int nper, double pv, double fv) {return pmt(r, nper, pv, fv) - ipmt(r, per, nper, pv, fv);}

static public double ppmt ( double r , int per , int nper , double pv , double fv ) { return pmt ( r , nper , pv , fv ) - ipmt ( r , per , nper , pv , fv ) ; }
static public double PPMT(double r, int per, int nper, double pv, double fv){return PMT(r, nper, pv, fv) - IPMT(r, per, nper, pv, fv);}
