
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
A factory produces a type of machine with a fixed cost (i.e., fixed investment) of 0.5 ten thousand yuan, and for every additional production of 100 units, an additional investment of 2.5 ten thousand yuan is required. Through investigation, the market's annual demand for this product is 500 units; the sales revenue is $R(t) = 6t - \frac{1}{2}t^2$ (in ten thousand yuan), where $t$ is the quantity of products sold (in hundreds of units) within the range $(0 < t \leqslant 5)$.  
(Note: ①Profit = Sales Revenue - Cost; ②If the production exceeds 500 units, it will result in inventory, and the inventory products are not included in the annual profit.)  
(1) Express the annual profit $y$ as a function of the annual production $x (x > 0)$.  
(2) At what annual production does the factory achieve the maximum annual profit?

Present the answer in LaTex format: \boxed{Your answer}
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