I prepared a serial dilution series by adding 50 l of the original undiluted sample to 4.95

I prepared a serial dilution series by adding 50 µl of the original undiluted sample to 4.95 ml of sterile diluent. I then repeated this step once using the diluted sample (rather than the original sample). I then added 0.5 ml of the doubly diluted sample to 4.5 ml of sterile diluent. What is the total dilution of the original sample?

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