
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 certain supermarket received a batch of strawberries. The relationship between the sales volume $x$ and the total sales price $y$ is as shown in the table below:

| Sales Volume $x (kg)$ | $1$   | $2$   | $3$   | $4$   | $\ldots$ |
|-----------------------|-------|-------|-------|-------|----------|
| Sales Total Price $y (元)$ | $40+0.5$ | $80+1.0$ | $120+1.5$ | $160+2.0$ | $\ldots$ |

Write down the relationship formula between the total sales price $y (元)$ and the sales volume $x (kg)$ based on the data in the table: ______.

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