let loanSteps = “”; const currencySymbol = “$”, fixedCurrency = “USD”; function calculateLoan(){ loanSteps=””; const loanAmount = parseFloat(document.getElementById(“loanAmount”).value); const interestRate = parseFloat(document.getElementById(“interestRate”).value) / 100; const loanTerm = parseFloat(document.getElementById(“loanTerm”).value) * 12; // Convert years to months const balloonPayment = parseFloat(document.getElementById(“balloonPayment”).value); if(isNaN(loanAmount) || isNaN(interestRate) || isNaN(loanTerm) || isNaN(balloonPayment) || loanAmount <= 0 || interestRate <= 0 || loanTerm <= 0){ alert("Please enter valid positive values for all fields."); return; } const monthlyInterestRate = interestRate / 12; const loanAmountAdjusted = loanAmount – balloonPayment; // Subtract balloon payment const monthlyPayment = (loanAmountAdjusted * monthlyInterestRate) / (1 – Math.pow(1 + monthlyInterestRate, -loanTerm)); document.getElementById("monthlyPayment").value = formatCurrency(monthlyPayment); loanSteps += `Inputs:
Loan Amount: ${formatCurrency(loanAmount)}
Interest Rate: ${(interestRate * 100).toFixed(2)}%
Loan Term: ${loanTerm / 12} years
Balloon Payment: ${formatCurrency(balloonPayment)}

`; loanSteps += `Formula:
Monthly Payment = [Loan Amount – Balloon Payment] × Monthly Interest Rate ÷ [1 – (1 + Monthly Interest Rate)^(-Loan Term)]

`; loanSteps += `Results:
Monthly Payment: ${formatCurrency(monthlyPayment)}
`; if(document.getElementById(“calculationSteps”).style.display===”block”){ document.getElementById(“calculationSteps”).innerHTML = loanSteps; } } function resetLoan(){ document.querySelectorAll(“#loan_calculator_form input”).forEach(el => el.value = “”); loanSteps=””; document.getElementById(“calculationSteps”).innerHTML = “

Not calculated yet.

“; } function toggleCalculationSteps(){ const s = document.getElementById(“calculationSteps”); const a = document.getElementById(“toggleArrow”); 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; }