Question: INVESTMENTS William's and Michael's stock holdings are given in the following table:
The prices (in dollars per share) of the stocks of BAC, GM, IBM, and TRW at the close of the stock market on a certain day are $50.26, $31.00, $103.07 and $38.67, respectively.
a. Write a 2 × 4 matrix A giving the stock holdings of William and Michael.
b. Write a 4 × 1 matrix B giving the closing prices of the stocks of BAC, GM, IBM, and TRW.
c. Use matrix multiplication to find the total value of the stock holdings of William and Michael at the market close.