- (void)calculateEquivalentPrincipalWithYear: (NSInteger)year borrow: (NSInteger)borrow rate: (double)rate {
int months = year*12.f;
double rest = borrow * 10000.f;
double interestRate = rate/100/12;
double perMonthPrincipal = rest/(months*1.f);
for (int i=months; i>0; i--) {
double interest = rest*interestRate;
rest = rest-perMonthPrincipal;
iceLog(@">>> No.%d need:%f, interest:%f, rest:%f",months-i+1, perMonthPrincipal, interest, rest);
}
}
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