Assume that an investor bought 2 shares of stock from Amazon and 2 shares of stock from Alibaba, at the very beginning. Next year in February, the investor bought 2 shares of Amazon and 3 shares of Ali Baba. At the end he sold all those shares. What is his/her IRR from the investment?

This is exactly what it says in my homework, it doesn't provide dates. But it is from whenever AMZN and BABA stock became public.

This is all the question provides