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A recreational (open) hot air balloon (i.e., Pinside ≈ Poutside has a volume of 2339m3 when...

A recreational (open) hot air balloon (i.e., Pinside ≈ Poutside has a volume of 2339m3 when fully inflated. The total weight of the balloon body, basket, ballast and pilot is 1950.2N (439lb). How much less dense must the air in the balloon be than the surrounding atmosphere in order to keep the balloon floating level near the ground? (That is, give the difference of the densities.)

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