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| sales_date | country | sales_volume | fix_costs |
|---|---|---|---|
| 2020-01-03 | DE | 500 | 2000 |
| 2020-01-03 | FR | 350 | 2000 |
| 2020-02-15 | DE | 0 | 5000 |
| 2020-02-15 | FR | 0 | 5000 |
| 2020-03-27 | DE | 180 | 4000 |
| 2020-03-27 | FR | 970 | 4000 |