I need this question answered and the parts answered as well, thank you in advance.

5. You need the following standard protein concentrations: 4mg/mL,1mg/mL,0.25mg/mL, and 0.0625mg/mL. Assume you need 20uL of each of the concentrations. (a) what is the procedure you use to create this set of standards? (b) what is the dilution factor used to prepare this set of standards? (c) describe how you would make this set of standards