How much of the stock solution should you aID

You are ready to run your gel but you discover that there is no more running buffer. You need to make 400 ml of 1X TBE containing 0.5 ug/ml ethidium bromide. The stock solution of ethidium bromide is at a concentration of 10 mg/ml. How much of the stock solution should you aID to your 400 ml of 1X TBE?

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