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var donationNoFees = 0.00; // Variable to Store Original Donation Amount

function oldValue() { // Store Original Donation Amount When Donation Field changes donationNoFees = Number(document.getElementById("amount").value); }

function percentage() { // Check to see if Add Fees Checkbox is checked var isAddFeesChecked = document.getElementById("addFees").checked;

if (isAddFeesChecked) { // Calculate the Percentage to add to the Donation Amount var a = 0.03; // Percent to calculate (3% - Can be changed) var b = Number(document.getElementById("amount").value); // Amount of Donation var c = ((a * b) + b).toFixed(2); // Calculate Percentage and add it to the donation amount. document.getElementById("amount").value = c.toString(); // Set Amount Field to new Donation amount

} else { // If Add Fees Checkbox is unchecked, revert back to original Donation Amount document.getElementById("amount").value = donationNoFees.toFixed(2); } }