1.183*10^11 square km
The total area is $4\pi \sum_0^{100}(3000+120n)^2$.
We ask Wolfram Alpha (leaving out the 4$\pi$):
Now we just have to multiply the result by 4$\pi$:
4$\pi$ * 9417240000 = 1.183*10^11 square km.
QED.
Klaus Æ. Mogensen
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