investment_percent_change.py

#!/bin/env python3

def main():
    purchase_price = 100
    current_price = 200

    percentage_change = round(((current_price - purchase_price) / purchase_price) * 100, 2)
    print(f"At ${current_price}, that is a change of {percentage_change}% from ${purchase_price}")

if __name__ == "__main__":
    main()