rmurphey-contest-response-10.js

function calculateTotal(baseTotal, tip, tax, fee) {
  // convert the tip to a number using base 10;
  // allow for a NaN result from parseFloat
  tip = parseFloat(tip) || 0;

  // don't allow a negative tip
  if (tip < 0) { tip = 0; }

  return baseTotal + tip + tax + fee;
}