calculate session price

main.dart

import 'dart:math' as math;
import 'dart:developer' as developer;

void main() {
  var sessionPrice = "125.00";
  print(calculateSessionPriceTotal(sessionPrice));
}

//////////////////////////////////////////////////////////////////
// N.B. For FlutterFlow, you only need to copy from here down
//      You must also include all "import" statements from the top
//////////////////////////////////////////////////////////////////


String calculateSessionPriceTotal(String subTotalString) {
  const double taxRate =  8.75;
  const double feeRate =  2.59;
  const double feeRatePerTransaction =  0.49;
  
  
  void log(String message) {
    var timestamp = new DateTime.now();
    var now = timestamp.toUtc().toIso8601String();
    // developer.log("$message\n", time: timestamp);
    print("$now | $message\n");
  }
  
  // convert input (string) to math double
  double subTotal = double.parse(subTotalString);
  
  // given a subtotal, calculate taxes and fees for session
  log("computing total session price where subTotal = \$$subTotal");
  log("using taxRate = $taxRate% and feeRate = $feeRate% and feeRatePerTransaction = $feeRatePerTransaction");
  var taxes = subTotal * (taxRate * .01);
  log("taxes computed; taxes = \$$taxes");
  var taxedTotal = subTotal + taxes;
  log("total with taxes; taxedTotal = \$$taxedTotal");
  var fees = (taxedTotal * (feeRate * .01)) + feeRatePerTransaction;
  log("fees computed; fees = \$$fees");
  var grandTotal = subTotal + taxes + fees;
  log("grand total; grandTotal = \$$grandTotal");
  // convert back to string and round to 2 decimal places
  return grandTotal.toStringAsFixed(2);
}