Assalam O Alaikum. I want to ask about an issue regarding employee pay and charges to client. lets say i have hired an engineer on 2000$/month on a year package and we charge our clients 30$per hour. The engineer worked 130 hours and we charged our client around 4000$ as engineers work means that i earned 2000$ more along with my profit percentage so i was wondering is it halal or haram because both parties are agreed client and my employee?