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

`; loanSteps += `Formulas:
Monthly Payment = Loan Amount × Monthly Interest / (1 – (1 + Monthly Interest)^-Number of Payments)
Total Payment = Monthly Payment × Number of Payments
Total Interest = Total Payment – Loan Amount

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

Not calculated yet.

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

Not calculated yet.

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