let housingLoanSteps = “”; function calculateHousingLoan(){ housingLoanSteps=””; const loanAmount = parseFloat(document.getElementById(“loanAmount”).value); const loanTerm = parseInt(document.getElementById(“loanTerm”).value); const interestRate = parseFloat(document.getElementById(“interestRate”).value) / 100; if (isNaN(loanAmount) || isNaN(loanTerm) || isNaN(interestRate) || loanAmount <= 0 || loanTerm <= 0 || interestRate <= 0) { alert("Please enter valid positive values for all fields."); return; } const monthlyInterestRate = interestRate / 12; const numberOfPayments = loanTerm * 12; const monthlyPayment = (loanAmount * monthlyInterestRate) / (1 – Math.pow(1 + monthlyInterestRate, -numberOfPayments)); document.getElementById("monthlyPayment").value = formatCurrency(monthlyPayment); housingLoanSteps += `Inputs:
Loan Amount: ₱${formatCurrency(loanAmount)}
Loan Term: ${loanTerm} years
Interest Rate: ${(interestRate * 100).toFixed(1)}%

`; housingLoanSteps += `Formula:
Monthly Payment = (Loan Amount × Monthly Interest Rate) / (1 – (1 + Monthly Interest Rate) ^ -Number of Payments)

`; housingLoanSteps += `Results:
Estimated Monthly Payment: ₱${formatCurrency(monthlyPayment)}
`; housingLoanSteps += `Tip: A lower interest rate or a longer loan term can help reduce your monthly payments, but may result in higher total interest over time.`; if (document.getElementById(“calculationStepsHousingLoan”).style.display === “block”) { document.getElementById(“calculationStepsHousingLoan”).innerHTML = housingLoanSteps; } } function resetHousingLoan() { document.querySelectorAll(“#calculator input”).forEach(el => el.value = “”); housingLoanSteps = “”; document.getElementById(“calculationStepsHousingLoan”).innerHTML = “

Not calculated yet.

“; } function toggleHousingLoanSteps() { const s = document.getElementById(“calculationStepsHousingLoan”); const a = document.getElementById(“toggleArrowHousingLoan”); if (s.style.display === “none” || s.style.display === “”) { s.style.display = “block”; a.style.transform = “rotate(180deg)”; s.innerHTML = housingLoanSteps || “

Not calculated yet.

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