let loanSteps = “”; const currencySymbol = “$”, fixedCurrency = “USD”; function calculateAutoLoan(){ loanSteps=””; const amount=parseFloat(document.getElementById(“loanAmount”).value); const rate=parseFloat(document.getElementById(“interestRate”).value)/100/12; const term=parseInt(document.getElementById(“loanTerm”).value); const extra=parseFloat(document.getElementById(“extraPayment”).value); if(isNaN(amount)||isNaN(rate)||isNaN(term)||isNaN(extra)||amount<=0||term<=0){ alert("Please enter valid positive values for all fields."); return; } const monthlyPayment = (amount * rate) / (1 – Math.pow(1 + rate, -term)) + extra; const totalInterest = (monthlyPayment * term) – amount; const monthsToPayOff = Math.ceil(amount / (monthlyPayment – extra)); document.getElementById("monthlyPayment").value = formatCurrency(monthlyPayment); document.getElementById("totalInterest").value = formatCurrency(totalInterest); document.getElementById("loanPaidOff").value = monthsToPayOff; loanSteps += `Inputs:
Loan Amount: ${formatCurrency(amount)}
Interest Rate: ${(rate*100).toFixed(2)}%
Term: ${term} months
Extra Payment: ${formatCurrency(extra)}

`; loanSteps += `Formulas:
Monthly Payment = Loan Amount × Interest Rate / (1 – (1 + Interest Rate)^-Term) + Extra Payment
Total Interest = Monthly Payment × Term – Loan Amount
Months to Pay Off Early = Loan Amount / (Monthly Payment – Extra Payment)

`; loanSteps += `Results:
Monthly Payment: ${formatCurrency(monthlyPayment)}
Total Interest: ${formatCurrency(totalInterest)}
Loan Paid Off Early: ${monthsToPayOff} months
`; if(document.getElementById(“calculationStepsLoan”).style.display===”block”){ document.getElementById(“calculationStepsLoan”).innerHTML = loanSteps; } } function resetAutoLoan(){ document.querySelectorAll(“#auto_loan_calculator_form input”).forEach(el=>el.value=””); loanSteps=””; document.getElementById(“calculationStepsLoan”).innerHTML=”

Not calculated yet.

“; } function toggleLoanSteps(){ const s=document.getElementById(“calculationStepsLoan”); const a=document.getElementById(“toggleArrowLoan”); if(s.style.display===”none”||s.style.display===””){ s.style.display=”block”;a.style.transform=”rotate(180deg)”; s.innerHTML=loanSteps||”

Not calculated yet.

“; }else{s.style.display=”none”;a.style.transform=”rotate(0deg)”;} } function formatCurrency(n){return currencySymbol+n.toFixed(2)+” “+fixedCurrency;}