A stock broker received an order from a client to buy 11,000 shares of CBA within ten minutes. Within those ten minutes, the following trades took place. The brokers clients are marked with a *.

Time	Price	Quantity
12:02:05	87.43	1300
12:04:57	86.74	1800
12:05:22	85.96	4200*
12:07:30	86.04	4900
12:08:12	85.78	3400*
12:08:57	85.71	9700
12:09:35	84.78	3400*

a. Calculate the market volume-weighted average price.

b. Calculate the stock brokers volume-weighted average price.

c. Using the volume-weighted average price method, assess the brokers execution performance.

d. Discuss the advantages and disadvantages of using the volume-weighted average price as tool for evaluating trading performance.