Question: FOREIGN EXCHANGE Ethan just returned to the United States from a Southeast Asian trip and wishes to exchange the various foreign currencies that he has accumulated for U.S. dollars. He has 1200 Thai bahts, 80,000 Indonesian rupiahs, 42 Malaysian ringgits, and 36 Singapore dollars. Suppose the foreign exchange rates are U.S. $0.03 for one baht, U.S. $0.00011 for one rupiah, U.S. $0.294 for one Malaysian ringgit, and U.S. $0.656 for one Singapore dollar.
a. Write a row matrix A giving the value of the various currencies that Ethan holds. (Note: The answer is not unique.)
b. Write a column matrix B giving the exchange rates for the various currencies.
c. If Ethan exchanges all of his foreign currencies for U.S. dollars, how many dollars will he have?