#!/usr/bin/env python3
import argparse

parser = argparse.ArgumentParser()
parser.add_argument("base_amount", type=float, help="Original amount of cash")
parser.add_argument("new_amount", type=float, help="Total cash now")
args = parser.parse_args()

total_return = (args.new_amount - args.base_amount) / args.base_amount * 100

print(round(total_return, 2), "%", sep="")