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The image shows a problem involving monthly telephone expenses and a table related to how these costs are calculated over several months (from month 2 to month 6). Here's a breakdown and translation of the key information:

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**Problem Summary**:
1. The basic monthly telephone cost is **180** units (元), with a per-second usage charge of **0.08** units (元) starting from month 2.
2. There is a table showing the balance difference of expenses (in 元) between different months (from months 2 to 6), when compared to month 1, which has a base cost of **180 元**. The numbers in the table reflect the expense difference for each month (positive or negative values).

| 月分(月) | 2 | 3 | 4 | 5 | 6 |
|---------|---|---|---|---|---|
| 該月通話費餘額(元) | 0 | +4 | -6 | +20 | +18 | +12 |
| 1月通話費餘額(元) | 180 元 (固定) |

**Questions**:
- If in **April (month 4)**, a total of 30 minutes were used, what is the actual usage charge for February (month 2)?
- How many seconds are used, and what is the calculation method?

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Monthly phone plan with a base cost of 180元 and additional charges of 0.08元 per second. Based on 30 minutes of usage in April, what is the usage charge for February?

Calculate monthly phone plan costs with a base fee of 180元 and an additional 0.08元 per second of usage. The problem involves determining the charge for February based on usage data provided for April. This arithmetic problem is suitable for students in Grades 6-8.

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