You wish to make 25 ml of chromomycin buffer with a final concentration of 0.010 M NaCl, 0.50 mM MgCl2, 0.010 M KCl, and 0.015 mM Na2HPO4. The stock solutions are 0.15 M NaCl, 2.5 M MgCl2, 0.030 M KCl, and 0.010 M Na2HPO4. What amount of each reagent and ddH20 is required to obtain the required 25 ml working solution