I have a CSV file that already contains the time-series data for an equity curve and I need a short, clean Python script that reads the file and presents the curve using Matplotlib in the default Classic style. The script should: • load the CSV reliably (the column with cumulative returns is labelled “equity”); • generate a clear, properly-labelled line chart (date on the x-axis, equity value on the y-axis); • include titles, axis labels, and a tight layout so the figure is presentation-ready; • save the plot both to screen and as a hi-res PNG. I’d like the code commented well enough that I can tweak colours or switch style sheets later if needed, but for now Classic is fine. If you spot any data-cleaning steps that will improve the result, feel free to add them with a brief note in the comments.