GMAT Verbal & Essays

A quote from a passage:

"The World bank estimates that removing current agricultural distortions would produce a general benefit of more than $300 billion a year. Relative to national income, poor countries would enjoy a third more of this benefit than rich, industrialized ones."

One of the questions on the passage:

It can be inferred that a removal of agricultural distortions would provide gains to poor countries of approximately:

(A) $300 million per year
(B) $500 million per year
(C) $100 billion per year
(D) $300 billion per year
(E) $500 billion per year

Answer according to the solution is C, which doesn't make sense if it says "a third MORE of this benefit than rich, industrialized ones." Am I reading the passage wrong?

Thanks

"The World bank estimates that removing current agricultural distortions would produce a general benefit of more than $300 billion a year. Relative to national income, poor countries would enjoy a third more of this benefit than rich, industrialized ones."

Total benfits = 300 billion
Poor get 1/3 more benefit than Rich say the share of the rich is 3x so Poor' nations share 4x
Ratio is 3:4 between rich and poor so Poor Nations' share is 180 billion. But no option.
But this is relative value the actual value is < 180 billion given the disparirty in income levels of rich and poor nations. A and B are too less fraction of the actual value
C is the closest to 180 billion
D and E are higher than the actual value.

(A) $300 million per year
(B) $500 million per year
(C) $100 billion per year
(D) $300 billion per year
(E) $500 billion per year