static public double ipmt(double r, int per, int nper, double pv, double fv) {return ipmt(r, per, nper, pv, fv, 0);}

static public double ipmt ( double r , int per , int nper , double pv , double fv ) { return ipmt ( r , per , nper , pv , fv , 0 ) ; }
static public double IPMT(double r, int per, int nper, double pv, double fv){return IPMT(r, per, nper, pv, fv, 0);}
