let promoSteps = “”; const currencySymbol = “$”, fixedCurrency = “USD”; function calculatePromo() { promoSteps = “”; const originalPrice = parseFloat(document.getElementById(“originalPrice”).value); const discountPercentage = parseFloat(document.getElementById(“discountPercentage”).value) / 100; const promoCode = document.getElementById(“promoCode”).value; if (isNaN(originalPrice) || isNaN(discountPercentage) || originalPrice <= 0) { alert("Please enter valid positive values for all fields."); return; } const discountAmount = originalPrice * discountPercentage; const finalPrice = originalPrice – discountAmount; document.getElementById("finalPrice").value = formatCurrency(finalPrice); promoSteps += `Inputs:
Original Price: ${formatCurrency(originalPrice)}
Discount Percentage: ${(discountPercentage * 100).toFixed(1)}%
Promo Code: ${promoCode || “None”}

`; promoSteps += `Formula:
Final Price = Original Price – (Original Price × Discount Percentage)

`; promoSteps += `Results:
Discount Amount: ${formatCurrency(discountAmount)}
Final Price: ${formatCurrency(finalPrice)}
`; promoSteps += `Tip: Always check if your promo code provides additional discounts.`; if (document.getElementById(“calculationStepsPromo”).style.display === “block”) { document.getElementById(“calculationStepsPromo”).innerHTML = promoSteps; } } function resetPromo() { document.querySelectorAll(“#promoCalculator input”).forEach(el => el.value = “”); promoSteps = “”; document.getElementById(“calculationStepsPromo”).innerHTML = “

Not calculated yet.

“; } function togglePromoSteps() { const s = document.getElementById(“calculationStepsPromo”); const a = document.getElementById(“toggleArrowPromo”); if (s.style.display === “none” || s.style.display === “”) { s.style.display = “block”; a.style.transform = “rotate(180deg)”; s.innerHTML = promoSteps || “

Not calculated yet.

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