const balanceInput = document.getElementById('balance-1');
      const interestRateInput = document.getElementById('interest-rate-1');
      const paymentInput = document.getElementById('payment-1');
      const calculateButton = document.getElementById('calculate-1');
      const payoffTimeOutput = document.getElementById('payoff-time-1');
      const totalInterestOutput = document.getElementById('total-interest-1');
      calculateButton.addEventListener('click', function() {
        const balance = parseFloat(balanceInput.value);
        const interestRate = parseFloat(interestRateInput.value);
        const payment = parseFloat(paymentInput.value);
        if (isNaN(balance) || isNaN(interestRate) || isNaN(payment)) {
          alert('Please enter valid numbers for all fields.');
          return;
        }
        const monthlyInterestRate = interestRate / 100 / 12;
        let remainingBalance = balance;
        let totalInterest = 0;
        let months = 0;
        while (remainingBalance > 0) {
          const interest = remainingBalance * monthlyInterestRate;
          totalInterest += interest;
          remainingBalance += interest;
          remainingBalance -= payment;
          if (totalInterest > 600) {
            alert('Payoff time is over 50 years. Please adjust your payment amount or interest rate.');
            payoffTimeOutput.textContent = '';
            totalInterestOutput.textContent = '';
            return;
          }
          months++;
        }
        const years = Math.floor(months / 12);
        const remainingMonths = months % 12;
        const payoffTime = years + ' years' + (remainingMonths > 0 ? ' and ' + remainingMonths + ' months' : '');
        payoffTimeOutput.textContent = payoffTime;
        totalInterestOutput.textContent = '$' + totalInterest.toFixed(2);
        
         // Display results
      document.querySelector('.result-1').style.display = 'block';
      });