let loanSteps = “”; const currencySymbol = “$”, fixedCurrency = “USD”; function calculateLoan(){ loanSteps=””; 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){ alert("Please enter valid positive values for all fields."); return; } const monthlyRate = interestRate / 12; const monthlyPayment = loanAmount * monthlyRate / (1 – Math.pow(1 + monthlyRate, -loanTerm)); const totalInterest = (monthlyPayment * loanTerm) – loanAmount; document.getElementById("monthlyPayment").value = formatCurrency(monthlyPayment); document.getElementById("totalInterest").value = formatCurrency(totalInterest); loanSteps += `Inputs:
Loan Amount: ${formatCurrency(loanAmount)}
Loan Term: ${loanTerm} months
Interest Rate: ${(interestRate*100).toFixed(2)}%

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

`; loanSteps += `Results:
Monthly Payment: ${formatCurrency(monthlyPayment)}
Total Interest: ${formatCurrency(totalInterest)}
`; 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 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;}