```py
monthly_salary = 3000
yearly_salary = monthly_salary * 12
tax_rate = 0.12
income_after_tax = yearly_salary * (1 - tax_rate)
```
```py
monthly_salary = 3000
yearly_salary = monthly_salary * 12
tax_rate = 0.12
income_after_tax = yearly_salary * (1 - tax_rate)
```