
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 dry and fresh distribution company in our city imported a type of dried shrimp weighing a total of 2000 kilograms. The purchase price was 20 yuan per kilogram. The Price Bureau stipulated that its selling price per kilogram must not exceed 50 yuan, nor fall below 20 yuan. Market research found that when the price is set at 50 yuan, an average of 30 kilograms is sold per day; for every 1 yuan decrease in price, an average of 2 more kilograms are sold per day. In the sales process, there is also a daily expense of 400 yuan (calculated as a whole day even if the day is not complete). Let the selling price per kilogram be x yuan, and the average daily profit be y yuan. Please solve the following questions:
(1) The average daily sales volume can be expressed as     ;
(2) The average daily sales revenue can be expressed as     ;
(3) The average daily profit can be expressed as y=     ;
(4) When the selling price per kilogram is how many yuan, the average daily profit is the maximum, and what is the maximum profit?
(5) If all of this shrimp is sold out, compare the two sales methods of maximizing average daily profit and the highest selling price, which one yields the most total profit?

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