let shippingSteps = “”; const currencySymbol = “$”, fixedCurrency = “USD”; function calculateShippingCost(){ shippingSteps=””; const weight = parseFloat(document.getElementById(“weight”).value); const destination = document.getElementById(“destination”).value; const shippingService = document.getElementById(“shippingService”).value; if(isNaN(weight) || weight <= 0 || destination.trim() === ""){ alert("Please enter valid values for all fields."); return; } let cost; if(shippingService === "economy") { cost = weight * 5; } else if(shippingService === "standard") { cost = weight * 10; } else { cost = weight * 20; } document.getElementById("costResult").value = formatCurrency(cost); shippingSteps += `Inputs:
Weight: ${weight} kg
Destination: ${destination}
Shipping Service: ${shippingService}

`; shippingSteps += `Formulas:
Cost = Weight × Service Rate

`; shippingSteps += `Results:
Estimated Shipping Cost: ${formatCurrency(cost)}
`; if(document.getElementById(“calculationStepsShipping”).style.display === “block”){ document.getElementById(“calculationStepsShipping”).innerHTML = shippingSteps; } } function resetShippingCalculator(){ document.querySelectorAll(“#calculator input, #calculator select”).forEach(el => el.value = “”); shippingSteps = “”; document.getElementById(“calculationStepsShipping”).innerHTML = “

Not calculated yet.

“; } function toggleShippingSteps(){ const s = document.getElementById(“calculationStepsShipping”); const a = document.getElementById(“toggleArrowShipping”); if(s.style.display === “none” || s.style.display === “”){ s.style.display = “block”; a.style.transform = “rotate(180deg)”; s.innerHTML = shippingSteps || “

Not calculated yet.

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