Answer: The relative Price of Hamburger has decreased, so Phillip would be expected to purchase more.
Step-by-step explanation:
Given that,
Price of Hamburger(H):
Last year = $5 per pound
This year = $8 per pound
Price of trout(T):
Last year = $6 per pound
This year = $9 per pound
Last year's Relative price of Hamburger =

=

= 0.833
This year's Relative price of Hamburger =

=

= 0.888
The relative Price of Hamburger has decreased, so Phillip would be expected to purchase more.