Shipping Arc.js Action Exercise 7-3

http.commerce.catalog.storefront.shipping.requestRates.after.js

module.exports = function(context, callback) {
  try {
      var firstShippingRatePrice = context.response.body.rates[0].shippingRates[0].amount;
      context.response.body.rates[0].shippingRates[0].amount = Math.floor(firstShippingRatePrice + (firstShippingRatePrice * 0.25));
  } catch(err) {
      console.error(err);
  }
  callback();
};