Respuesta :
Let x = dollars per hour (the payment per hour)
(4 + 8)x + 50 = 164
By solving we can determine that x = $9.50
You would earn $9.50 per hour for 12 hours work ($114). Since you are not earning the $50 bonus as part of your hourly rate, you would need to subtract this from ($164). Then divide. ($114 / 12 = $9.50).