DMSO is often the solvent of choice to dissolve test substances against the malaria Parasite in culture. However DMSO at concentrations >0.4% (v/v) is toxic to cells. From a 25 m M stock solution in 100% DMSO, how and in what will you make dilutions such that the test substance is present in the well at 250 mM but the DMSO concentration is 0.4%?

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