Divide annual salary by 52.18 = weekly rate
Divide weekly rate by 37.5 = hourly rate
Multiply hourly rate by 2 = Time x 2
For example, if the annual salary is equal to €51,783
Divide €51,783 by 52.18 = €992.39
Divide €992.39 by 37.5 = €26.46
Multiply €26.46 by 2 = €52.92