Please go throught the slides to learn how to do currency conversion.  If you are selling money, you have to think that the bank is buying it, so use the "Bank Buying rate" column and if you are buying foreign currency, the bank is selling it, so use "Bank Selling Rate" column.  To summarize:  think in terms of the bank when determining which column to use.

**  Homework is question 1-5. It is posted in a separate entry above.