Could you please help me with the following questions?

2. In order to conduct cutting edge research, a chemistry lab decides to hire research assistants. The competitive wage for lab research assistants is $2 5 / hour. The lab is able to gure out how much additional productivity they get from hiring each additional research assistant and express that in dollars per hour. Given they know how much they have to pay each additional research assistant, and how much additional productivity they will get from each research assistant, how should they determine how many research assistants to hire? Explain your reasoning. [This is not a math problem to work out. This is a short answer question]