Cindy uses the services of a brokerage firm to buy and sell stocks. The firm charges 1.5% service charges on the total amount for each transaction -- buy or sell. When Cindy sells stocks, she would...

Cindy uses the services of a brokerage firm to buy and sell stocks. The firm charges 1.5% service charges on the total amount for each transaction -- buy or sell.

When Cindy sells stocks, she would like to know if she gained or lost on a particular investment. Write a program that reads in the number of shares sold, the purchase price of each share, and the selling price of each share. Use a file to get this information. The program outputs to a file the amount invested, the total service charges, amount gained or lost, and the amount received after selling the stock.

The program needs to be written in Python.