let amortizationSteps = “”; const currencySymbol = “$”, fixedCurrency = “USD”; function calculateAmortization(){ amortizationSteps=””; const loanAmount=parseFloat(document.getElementById(“loanAmount”).value); const interestRate=parseFloat(document.getElementById(“interestRate”).value)/100; const loanTerm=parseInt(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 monthlyInterestRate = interestRate / 12; const numberOfPayments = loanTerm * 12; const monthlyPayment = (loanAmount * monthlyInterestRate) / (1 – Math.pow(1 + monthlyInterestRate, -numberOfPayments)); document.getElementById("monthlyPayment").value = formatCurrency(monthlyPayment); amortizationSteps += `Inputs:
Loan Amount: ${formatCurrency(loanAmount)}
Interest Rate: ${(interestRate*100).toFixed(2)}%
Loan Term: ${loanTerm} years

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

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

Not calculated yet.

“; } function toggleAmortizationSteps(){ const s=document.getElementById(“amortizationSchedule”); const a=document.getElementById(“toggleArrowAmortization”); if(s.style.display===”none”||s.style.display===””){ s.style.display=”block”;a.style.transform=”rotate(180deg)”; s.innerHTML=amortizationSteps||”

Not calculated yet.

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