
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 market survey shows that the sales volume (in pieces) and price (in yuan) of a certain small commodity in a city in the past 20 days are functions of time t (in days). The sales volume approximately satisfies g(t) = 80 - 2t (pieces), and the price approximately satisfies f(t) = 20 - |t - 10| (yuan).

1. Write the function expression of the daily sales y of this commodity with time t (0 ≤ t ≤ 20);
2. Find the maximum and minimum values of the daily sales y of this commodity.

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