
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 subsidiary company sells a brand of products, with each product costing 30 yuan and requiring a management fee of a yuan (where a is a constant, 2≤a≤5) to be paid to the head office. According to statistical experience, the product's annual sales volume is estimated to be $\frac {k}{e^{x}}$ ten thousand units when each product is sold at x yuan. It is known that the product's annual sales volume is 50 million units when each product is sold at 40 yuan. The pricing department has set the minimum and maximum prices for each product, with the lowest being no less than 35 yuan and the highest not exceeding 41 yuan.
(1) Find the functional relationship L(x) between the subsidiary company's annual profit (in ten thousand yuan) and each product's selling price x (in yuan);
(2) Determine the selling price of each product when the product's annual profit L(x) is at its maximum, and find the maximum value of L(x).
Reference formula: (c^{ax+b})'=ae^{ax+b} (a, b are constants)

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