<script>
function calculateROI() {
const count = document.getElementById('forklift-count').value;
const life = document.getElementById('lead-acid-life').value;
const savings = document.getElementById('monthly-savings').value;

// 5년간 납축 배터리 교체 비용 (대당 약 300만원 가정)
const replacementCount = Math.floor(60 / life);
const totalReplacementCost = count * replacementCount * 3000000;

// 5년간 유지비 절감액
const totalMonthlySavings = count * savings * 60;

const totalProfit = totalReplacementCost + totalMonthlySavings;

document.getElementById('result').style.display = 'block';
document.getElementById('total-profit').innerText = "약 " + (totalProfit / 10000).toLocaleString() + " 만원";
}
</script>