Joanna bought

[robinkomail]

[Deleted because this question is from a banned source - see below.]

Can you please provide you logic in reaching the answer. Thanks.

[Ben Ku]

Please cite the source (author) of this problem. We cannot reply unless a source is cited (and, if no source is cited, we will have to delete the post!). Thanks.

[ai42]

This question is from the OG 12.

[Ben Ku]

OG is a banned source; it is illegal to post OG questions anywhere on the web.
If you are in one of our classes, please ask OG questions during office hours or before/after class.