The table shows the annual income tax paid by individuals in a country at different levels of gross income.
| Annual Income | Tax paid |
|---|---|
| €30 000 | €3 500 |
| €40 000 | €5 000 |
| €50 000 | €7 500 |
| €60 000 | €11 500 |
| €70 000 | €16 500 |
What is the marginal tax rate if an individual's annual income increases from €50 000 to €60 000?
15%
25%
40%
50%
