//Send this function a loan amount and a down Payment, ant it will return
//your monthlyMI

function PMICalculator (loanAmt, downPaymentAmt)
{
  var loanAmount = new Number(loanAmt);
  var salesPrice = new Number(loanAmount + downPaymentAmt);
  var LTV = loanAmount/salesPrice;
  var PMIRate = true;
  var LTVThreshold = 0.8;
  var monthlyMI = new Number(0.0);

  if (LTV < LTVThreshold)
	{
        PMIRate = false;
    }

  if (PMIRate)
	 {
		if ((LTV < 0.85)||(LTV == 0.85))
		  {
			PMIRate = 0.0032;
		  }
		else if ((LTV < 0.90)||(LTV == 0.90))
		  {
			PMIRate = 0.0052;
		  }
		else if ((LTV < 0.95)||(LTV == 0.95))
		  {
			PMIRate = 0.0078;
		  }
		else
		  {
			PMIRate = 0.0090;
		  }

        monthlyMI = loanAmt * PMIRate/12;
	}

  return monthlyMI;
}