A person has 400 million alveoli per lun...

A person has 400 million alveoli per lung with an average radius of 0.1 mm for each alveolus. Considering the alveoli are spherical in shape, the total respiratory surface of that person is closest to

`50xx10^6mm^2`

`200xx10^6mm^2`

`100xx10^6mm^2`

`1000xx10^6mm^2`

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