Voltage drop calculation with 2 different cunductor sizes

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I'm sure this has been covered before, but I haven't found the exact scenario. I have a 200' total run to an outdoor yard outlet. Approx. 50 feet of this will be from the breaker to the outside wall of basement. From there approx 150' of UF. I will have a 20A 120v duplex receptacle. How do I calculate the VD if the 50' run is say, 6ga. And the remaining 150' is 8ga? I would like to size things for the full 20A capacity even though it likely wouldn't be more than a 15a load.

Thanks.
 
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