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a) Show that the colume occupised by the ballon is then V = V0(T1/T0)e^(+cy) where c = pg/P0 = 1.25 X 10^4 m^-1.

b) Show that the buoyant force does not depend on altitude y. Assume that the skin of the ballon maintains the helium pressure at a constant factor of 1.05 times greater than the outside pressure. [Hint] Assume that the pressure change with altitude is P = (P0)e^(+cy).

I was able to use the hint to do a), but I'm confused by b). Why does the book say to assume he skin of the ballon maintains the helium pressure at a constant factor of 1.05 times greater than the outside pressure?