function calculateMonthlyPayment( loan, interest, years ) {
  var interestPerYear = (interest/100.0 * loan) ;
  var interestForAllYears = years * interestPerYear ;
  var totalPayment = loan/1 + interestForAllYears ;
  var monthlyPayment = totalPayment / (years*12) ;
  return monthlyPayment.toFixed(2) ;
}

function calculateCarLoanInfo( loan, interest, years ) {
  var interestPerYear = (interest/100.0 * loan) ;
  var totalInterest = years * interestPerYear ;
  var totalPayment = loan/1 + totalInterest ;
  var monthlyInstalment = totalPayment / (years*12) ;
  return {
    "totalInterest" : totalInterest.toFixed(2),
    "monthlyInstalment" : monthlyInstalment.toFixed(2)
  };
}